#include <iostream>
#include <fstream>
#include <cstring>
#include <vector>

#define MAXN 2000001
#define PRIME 73
#define MOD1 100007
#define MOD2 100021

using namespace std;

/**

                                          `-.`'.-'
                                       `-.        .-'.
                                    `-.    -./\.-    .-'
                                        -.  /_|\  .-
                                    `-.   `/____\'   .-'.
                                 `-.    -./.-""-.\.-      '
                                    `-.  /< (()) >\  .-'
                                  -   .`/__`-..-'__\'   .-
                                ,...`-./___|____|___\.-'.,.
                                   ,-'   ,` . . ',   `-,
                                ,-'   ________________  `-,
                                   ,'/____|_____|_____\
                                  / /__|_____|_____|___\
                                 / /|_____|_____|_____|_\
                                ' /____|_____|_____|_____\
                              .' /__|_____|_____|_____|___\
                             ,' /|_____|_____|_____|_____|_\
,,---''--...___...--'''--.. /../____|_____|_____|_____|_____\ ..--```--...___...--``---,,
                           '../__|_____|_____|_____|_____|___\
      \    )              '.:/|_____|_____|_____|_____|_____|_\               (    /
      )\  / )           ,':./____|_____|_____|_____|_____|_____\             ( \  /(
     / / ( (           /:../__|_____|_____|_____|_____|_____|___\             ) ) \ \
    | |   \ \         /.../|_____|_____|_____|_____|_____|_____|_\           / /   | |
 .-.\ \    \ \       '..:/____|_____|_____|_____|_____|_____|_____\         / /    / /.-.
(=  )\ `._.' |       \:./ _  _ ___  ____  ____ _    _ _ _ _ _  _ __\        | `._.' /(  =)
 \ (_)       )        \/                                            \       (       (_) /
  \    `----'          """"""""""""""""""""""""""""""""""""""""""""""        `----'    /
   \   ____\__                                                              __/____   /
    \ (=\     \                                                            /     /-) /
     \_)_\     \                                                         /     /_(_/
          \     \                                                        /     /
           )     )  _                                                _  (     (
          (     (,-' `-..__                                    __..-' `-,)     )
           \_.-''          ``-..____                  ____..-''          ``-._/
            `-._                    ``--...____...--''                    _.-'
                `-.._                                                _..-'
                     `-..__       FORTIS FORTUNA ADIUVAT       __..-'
                           ``-..____                  ____..-''
                                    ``--...____...--''

*/

class parser{
    public:
        parser() {}
        parser(const char *file_name){
            input_file.open(file_name,ios::in | ios::binary);
            input_file.sync_with_stdio(false);
            index=0;
            input_file.read(buffer,SIZE);}
        inline parser &operator >>(char n[]){
            for (;buffer[index]<'0' or buffer[index]>'z';inc());
            int it=0;
            for (;'0'<=buffer[index] and buffer[index]<='z';inc())
                n[it++]=buffer[index];
            n[it]='\0';
            return *this;}
        ~parser(){
            input_file.close();}
    private:
        fstream input_file;
        static const int SIZE=0x400000;
        char buffer[SIZE];
        int index=0;
        inline void inc(){
            if(++index==SIZE)
                index=0,input_file.read(buffer,SIZE);}
};

class writer{
    public:
        writer() {};
        writer(const char *file_name){
            output_file.open(file_name,ios::out | ios::binary);
            output_file.sync_with_stdio(false);
            index&=0;}
        inline writer &operator <<(int target){
            aux&=0;
            n=target;
            if (!n)
                nr[aux++]='0';
            for (;n;n/=10)
                nr[aux++]=n%10+'0';
            for(;aux;inc())
                buffer[index]=nr[--aux];
            return *this;}
        inline writer &operator <<(const char *target){
            aux&=0;
            while (target[aux])
                buffer[index]=target[aux++],inc();
            return *this;}
        ~writer(){
            output_file.write(buffer,index);output_file.close();}
    private:
        fstream output_file;
        static const int SIZE=0x200000; ///2MB
        int index,aux,n;
        char buffer[SIZE],nr[24];
        inline void inc(){
            if(++index==SIZE)
                index&=0,output_file.write(buffer,SIZE);}
};

char A[MAXN],B[MAXN];
int matches[MAXN];

parser f ("strmatch.in");
writer t ("strmatch.out");

int main()
{
    f>>A>>B;
    int dimA=strlen(A);
    int dimB=strlen(B);
    int P1=1,P2=1,hashA1=0,hashA2=0;
    for (int i=0;i<dimA;++i){
        hashA1=(hashA1*PRIME+A[i])%MOD1;
        hashA2=(hashA2*PRIME+A[i])%MOD2;
        if (i!=0)
            P1=(P1*PRIME)%MOD1,
            P2=(P2*PRIME)%MOD2;
    }
    if (dimA>dimB){
        t<<0;
        return 0;
    }
    int hash1=0,hash2=0;
    for (int i=0;i<dimA;++i)
        hash1=(hash1*PRIME+B[i])%MOD1,
        hash2=(hash2*PRIME+B[i])%MOD2;
    int nr=0;
    if (hash1==hashA1 and hash2==hashA2)
        /*matches.push_back(0)*/matches[0]=1,++nr;
    for (int i=dimA;i<dimB/* and nr<1000*/;++i){
        hash1=((hash1-(B[i-dimA]*P1)%MOD1+MOD1)*PRIME+B[i])%MOD1;
        hash2=((hash2-(B[i-dimA]*P2)%MOD2+MOD2)*PRIME+B[i])%MOD2;
        if (hash1==hashA1 and hash2==hashA2)
            matches[i-dimA+1]=1,
            ++nr;
    }
    t<<nr<<"\n";
    nr&=0;
    for (int i=0;i<dimB and nr<1000;++i)
        if (matches[i]){
            ++nr,
            t<<i<<" ";}
    return 0;
}