#include <bits/stdc++.h>

using namespace std;

ifstream fin("strmatch.in");
ofstream fout("strmatch.out");

const int NMAX = 2000000;
const int MOD = 1e9 + 7; //
const int BASE = 29;

int n, m;
char A[NMAX + 1], B[NMAX + 1];
int powBASE[NMAX + 1];
int nr, v[1001];
int hA, hB;

// n n-1        0
// [------------]
//  [------------]
//  n n-1        0

int main() {
	fin >> A >> B;
	n = strlen(A);
	m = strlen(B);

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

	powBASE[0] = 1;
	for(int i = 1; i <= n; i++) {
		powBASE[i] = (long long) powBASE[i - 1] * BASE % MOD;
	}

	for(int i = 0; i < n; i++) {
		hA = (long long) hA * BASE % MOD + (A[i] - 'A');
		if(hA >= MOD) {
			hA -= MOD;
		}
	}

	for(int i = 0; i < n; i++) {
		hB = (long long) hB * BASE % MOD + (B[i] - 'A');
		if(hB >= MOD) {
			hB -= MOD;
		}
	}

	if(hA == hB) {
		nr++;
		v[nr] = 0;
	}

	for(int i = 1; i + n - 1 < m; i++) {
		hB -= (long long) (B[i - 1] - 'A') * powBASE[n - 1] % MOD;
		if(hB < 0) {
			hB += MOD;
		}
		hB = (long long) hB * BASE % MOD;
		hB += (B[i + n - 1] - 'A');
		if(hB >= MOD) {
			hB -= MOD;
		}

		if(hA == hB) {
			nr++;
			if(nr <= 1000) {
				v[nr] = i;
			}
		}
	}

	fout << nr << '\n';
	for(int i = 1; i <= min(nr, 1000); i++) {
		fout << v[i] << " ";
	}
	return 0;
}