#include <iostream>
#include <fstream>
#include <vector>
#include <string.h>

using namespace std;
ifstream in("strmatch.in");
ofstream out("strmatch.out");

#define pb push_back
typedef long long ll;
const int NMax = 2e6 + 5;
const int base = 73;
const int mod1 = 100003;
const int mod2 = 100005;

int N,M;
char patt[NMax],str[NMax];
vector<int> sol;

int main() {
    in>>(patt+1)>>(str+1);
    N = strlen(patt+1);
    M = strlen(str+1);

    int strHash1 = 0,strHash2 = 0, pattHash1 = 0, pattHash2 = 0,pw1 = 1,pw2 = 1;
    for (int i=1;i<=N;++i) {
        pattHash1 = (pattHash1 * base + patt[i] * base) % mod1;
        pattHash2 = (pattHash2 * base + patt[i] * base) % mod2;

        strHash1 = (strHash1 * base + str[i] * base) % mod1;
        strHash2 = (strHash2 * base + str[i] * base) % mod2;

        pw1 = (pw1 * base) % mod1;
        pw2 = (pw2 * base) % mod2;
    }

    if (pattHash1 == strHash1 && pattHash2 == strHash2) {
        sol.pb(0);
    }

    for (int i=N+1;i<=M;++i) {
        strHash1 = ((strHash1 - (str[i-N] * pw1) % mod1 + mod1) * base + str[i] * base) % mod1;
        strHash2 = ((strHash2 - (str[i-N] * pw2) % mod2 + mod2) * base + str[i] * base) % mod2;

        if (pattHash1 == strHash1 && pattHash2 == strHash2) {
            sol.pb(i-N);
        }
    }

    out<<sol.size()<<'\n';
    int lim = (1000 < sol.size()) ? 1000 : sol.size();
    for (int i=0;i<lim;++i) {
        out<<sol[i]<<' ';
    }

    in.close();out.close();
    return 0;
}