#include <bits/stdc++.h>
using namespace std;

ifstream f("strmatch.in");
ofstream g("strmatch.out");

#define cout g
#define nmax 2000002
#define BASE 75
#define MOD1 999983
#define MOD2 999981

char pattern[nmax],text[nmax];
int hash_pat1,hash_pat2,hash_tx1,hash_tx2,P1,P2;
int n,m,i;
vector <int> sol;

int main()
    {
    f>>(pattern);
    f>>(text);
    n=strlen(pattern);
    m=strlen(text);

    if(n>m){cout<<"0";return 0;}

    P1=P2=1;

    for(i=0; i<n; ++i)
        {
        hash_pat1 = (hash_pat1 * BASE + pattern[i] - '0') % MOD1;
        hash_pat2 = (hash_pat2 * BASE + pattern[i] - '0') % MOD2;

        if(i>0)
            {
            P1 = P1 * BASE % MOD1;
            P2 = P2 * BASE % MOD2;
            }
        }

    for(i=0;i<n;++i)
    {
        hash_tx1 = (hash_tx1 * BASE + text[i] - '0') % MOD1;
        hash_tx2 = (hash_tx2 * BASE + text[i] - '0') % MOD2;
    }

    if(hash_tx1==hash_pat1 && hash_tx2==hash_pat2) sol.push_back(0);

    for(i=n;i<m;++i)
    {
        hash_tx1 = ((hash_tx1 - (text[i-n] - '0') * P1 % MOD1 + MOD1) * BASE + text[i] - '0') % MOD1;
        hash_tx2 = ((hash_tx2 - (text[i-n] - '0') * P2 % MOD2 + MOD2) * BASE + text[i] - '0') % MOD2;

        if(hash_tx1==hash_pat1 && hash_tx2==hash_pat2) sol.push_back(i-n+1);
    }
    cout<<sol.size()<<'\n';
    for(i=0;i<min((int)sol.size(),1000);++i) cout<<sol[i]<<' ';
    }