#include <bits/stdc++.h>
#define mod1 100007
#define mod2 100021
#define P 73
using namespace std;
ifstream fin("strmatch.in");
ofstream fout("strmatch.out");

char a[2000200], b[2000200];
long long nrh1,nr1h1, nrh2, nr1h2;
long fr, ans[2000200];
int main()
{

    fin.getline(a,2000200);
    fin.getline(b,2000200);
    long long exp1=1, exp2=1;
    int n=strlen(a), m=strlen(b);

    for(int i=0;i<n;++i)
    {
        nrh1=(nrh1*P+b[i])%mod1;
        nrh2=(nrh2*P+b[i])%mod2;

        nr1h1=(nr1h1*P+a[i])%mod1;
        nr1h2=(nr1h2*P+a[i])%mod2;
        if(i!=0){
        exp1=exp1*P%mod1;
        exp2=exp2*P%mod2;
        }
    }

    if(nr1h1==nrh1 && nrh2==nr1h2)
    {
        ++fr;
        ans[fr]=0;
    }

    for(int i=n;i<m;++i)
    {
        nrh1=(((nrh1-b[i-n]*exp1)%mod1+mod1)*P+b[i])%mod1;
        nrh2=(((nrh2-b[i-n]*exp2)%mod2+mod2)*P+b[i])%mod2;
        if(nr1h1==nrh1 && nr1h2==nrh2 )
        {
            ++fr;
            ans[fr]=i-n+1;
        }
    }

    fout<<fr<<'\n';
    for(int i=1;i<=fr && i<=1000;++i)
        fout<<ans[i]<<" ";

    return 0;
}