#include <bits/stdc++.h>
#define dim 2000005
using namespace std;
ifstream f("strmatch.in");
ofstream g("strmatch.out");
char a[dim],b[dim];
int pref[dim];
vector <int> poz;
int main()
{
    f>>(a+1)>>(b+1);
    int n=strlen(a+1),m=strlen(b+1),k=0;
    for(int i=2; i<=n; ++i)
    {
        while(k&&a[k+1]!=a[i])
            k=pref[k];
        if(a[k+1]==a[i])
            ++k;
        pref[i]=k;
    }
    int ans=0;
    for(int i=1; i<=m; ++i)
    {
        while(k&&a[k+1]!=b[i])
            k=pref[k];
        if(a[k+1]==b[i])
            ++k;
        if(k>=n)
        {
            ++ans;
            poz.push_back(i-n);
        }
    }
    g<<ans<<'\n';
    for(int i=0; i<ans; ++i)
        g<<poz[i]<<" ";
    return 0;
}