#include<bits/stdc++.h>
#define DIM 2000001
using namespace std;
ifstream fin("strmatch.in");
ofstream fout("strmatch.out");
int lps[DIM], ans[DIM];
int n, m, i, j, k;
string a, b;
void Compute_LPS(){
    for(i=1;i<n;i++){
        while(j > 0 && a[i] != a[j])
            j = lps[j - 1];
        if(a[j] == a[i])
            j++;
        lps[i] = j;
    }
}
void KMP(){
    Compute_LPS();
    j = 0;
    for(i=0;i<m;i++){
        while(j > 0 && a[j] != b[i])
            j = lps[j - 1];
        if(a[j] == b[i])
            j++;
        if(j == n){
            ans[++k] = i - n + 1;
            j = lps[j - 1];
        }
    }
}
int main(){
    fin >> a >> b;
    n = a.size();
    m = b.size();
KMP();
fout << k << "\n";
for(i=1;i<=min(1000, k);i++)
    fout << ans[i] << " ";
}