#include <iostream>
#include <cstdio>
#include <string.h>
#define LMC 2000005
using namespace std;

void prefix();
char A[LMC],B[LMC];
int pi[LMC],M,N,n,rez[1025];
int main()
{
    int i,q=0;
    freopen("strmatch.in","r",stdin);
    freopen("strmatch.out","w",stdout);
    A[0]=' ';
    B[0]=' ';
    cin >> (A+1) >> (B+1);
    M=strlen(A)-1;
    N=strlen(B)-1;
    prefix();
    for(i=1;i<=N;i++)
    {
        while(q&&A[q+1]!=B[i])
            q=pi[q];
        if(A[q+1]==B[i]) q++;
        if(q==M)
        {
            q=pi[M];
            n++;
            if(n<=1000)
                rez[n]=i-M;
        }
    }
    cout << n << endl;
    if(n>=1000) n=1000;
    for(i=1;i<=n;i++) cout << rez[i] << " ";
    return 0;
}
void prefix()
{
    int i,q=0;
    pi[1]=0;
    for(i=2;i<=M;i++)
    {
        while(q&&A[q+1]!=A[i])
            q=pi[q];
        if(A[q+1]==A[i]) q++;
        pi[i]=q;
    }
}