#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
ifstream in("strmatch.in");
ofstream out("strmatch.out");
char a[2000005], b[2000005];
int i, n, sa, sb, sp[2000005], j, k, f[2000005], cate;
int main()
{
    in>>a;
    in>>b;
    sa=strlen(a);
    sb=strlen(b);
    j=0;
    sp[j]=0;
    for(i=1; i<=sa; ++i)
    {
        if(a[i]==a[j])
        {
            sp[i]=j+1;
            ++j;
        }
        else
        {
            while(j>0 && a[j]!=a[i])
            {
                j=sp[j-1];
            }
            if(a[i]==a[j])
            {
                sp[i]=j+1;
                ++j;
            }
            else
                sp[i]=0;
        }
    }
    j=0;
    for(i=0; i<=sb; ++i)
    {
        if(a[j]==b[i])
            ++j;
        else
        {
            while(j!=0 && a[j]!=b[i])
                j=sp[j-1];
            if(a[j]==b[j])
                ++j;
        }
        if(j==sa)
        {
            ++cate;
            f[cate]=i-sa+1;
            j=sp[j-1];
        }
    }
    out<<cate<<"\n";
    if(cate>1000)
        cate=1000;
    for(i=1; i<=cate; ++i)
        out<<f[i]<<" ";
    return 0;
}