#include <cstdio>
#include <cstring>
#define Nmax 2000005

using namespace std;

int N,M,pi[Nmax],sol[Nmax];
char a[Nmax],b[Nmax];

inline void Pi()
{
    int k=0,i;
    pi[1]=0;
    for(i=2;i<=N;++i)
    {
        while(k && a[k+1]!=a[i])
            k=pi[k];
        if(a[k+1]==a[i])
            ++k;
        pi[i]=k;
    }
}

int main()
{
    int i,k=0;
    freopen ("strmatch.in","r",stdin);
    freopen ("strmatch.out","w",stdout);
    scanf("%s%s", (a+1),(b+1));
    N=strlen(a+1); M=strlen(b+1);
    Pi();
    for(i=1;i<=M;++i)
    {
        while(k && a[k+1]!=b[i])
            k=pi[k];
        if(a[k+1]==b[i])
            ++k;
        if(k==N)
            sol[++sol[0]]=i-N;
    }
    printf("%d\n", sol[0]);
    for(i=1;i<=sol[0] && i<=1000;++i)
        printf("%d ", sol[i]);
    printf("\n");
    return 0;
}