#include <bits/stdc++.h>
#define NM  2000005
#define MOD int(1e9+9)
///single Hash
using namespace std;
ifstream fin ("strmatch.in");
ofstream fout ("strmatch.out");
int n, m;
long long p[NM], h[NM], hs;
char s[NM], t[NM];
vector<int> rez;
int main()
{
    fin.getline(s, NM);
    fin.getline(t, NM);
    n = strlen(t);
    m = strlen(s);
    p[0] = 1;
    for(int i=1; i<=n; i++)
        p[i] = (long long)(p[i-1]*31)%MOD;
    for(int i=0; i<n; i++)
        h[i] = (((i>0)? h[i-1]: 0) + p[i]*(t[i]-'0'+1) %MOD)%MOD;
    for(int i=0; i<m; i++)
        hs = (long long)(hs + p[i]*(s[i]-'0'+1))%MOD;
    for(int i=m-1; i<n; i++)
        if( ((hs*p[i-m+1])%MOD) == ((h[i]- ((i>=m)?h[i-m]:0)+MOD)%MOD))
            rez.push_back(i-m+1);
    fout << rez.size() << '\n';
    int nr = 0;
    for(auto it:rez)
        if(nr > 1000)
            break;
        else fout << it << ' ', nr++;
    return 0;
}