#include <bits/stdc++.h>

#if 1
#define pv(x) cout<<#x<<" = "<<x<<"; ";cout.flush()
#define pn cout<<endl
#else
#define pv(x)
#define pn
#endif

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

using ll = long long;
using ull = unsigned long long;
using uint = unsigned int;
#define pb push_back
const int NMax = 2e6 + 5;
const int inf = 1e9 + 5;
using zint = int;

int N,M,nrSol;
int pf[NMax],sol[NMax];
char patt[NMax],str[NMax];

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

    int k = 0;
    for (int i = 2;i <= N;++i) {
        while (patt[k+1] != patt[i] && k != 0) {
            k = pf[k];
        }

        if (patt[k+1] == patt[i]) {
            ++k;
        }

        pf[i] = k;
    }

    k = 0;
    for (int i = 1;i <= M;++i) {
        while (patt[k+1] != str[i] && k != 0) {
            k = pf[k];
        }

        if (patt[k+1] == str[i]) {
            ++k;
            if (k == N) {
                sol[++nrSol] = i - N;
                k = pf[k];
            }
        }
    }

    out<<nrSol<<'\n';
    nrSol = min(1000,nrSol);
    for (int i = 1;i <= nrSol;++i) {
        out<<sol[i]<<' ';
    }

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