#include <bits/stdc++.h>
using namespace std;
ifstream fin("strmatch.in");
ofstream fout("strmatch.out");
int i, n, m, k, p[4000005], r, q;
string s1, s2, s;
int main()
{
    fin>>s1>>s2;
    n=s1.size();
    m=s2.size();
    s=s1+'#'+s2;
    p[0]=-1;
    for (i=1; i<=n+m+1; i++) {
        k=p[i-1];
        while (k>=0 && s[k]!=s[i-1]) k=p[k];
        p[i]=k+1;
        if (p[i]==n) {q++;}
    }
    fout<<q<<'\n';
    for (i=2*n; i<=n+m+1; i++) {
        if (p[i]==n) {
            r++;
            if (r==1001) break;
            fout<<i-2*n-1<<' ';
        }
    }
    return 0;
}