#include <stdio.h>
#include <string.h>
#define MAX 2000005

char a[MAX], b[MAX];
int n, m, i, k, pi[MAX], l[MAX], nr;

int main(){
	freopen("strmatch.in", "r", stdin);
	freopen("strmatch.out", "w", stdout);
	scanf("%s\n%s", a + 1, b + 1);
	n = strlen(a + 1), m = strlen(b + 1);
	k = 0;
	pi[1] = 0;
	for(i = 2; i <= n; i++){
		while(k > 0 && a[k + 1] != a[i])
			k = pi[k];
		if(a[k + 1] == a[i])
			k++;
		pi[i] = k;
	}

	k = 0;
	for(i = 1; i <= m; i++){
		while(k > 0 && a[k + 1] != b[i])
			k = pi[k];
		if(a[k + 1] == b[i])
			k++;
		if(k == n){
			nr++;
			if(nr <= 1000)
				l[nr] = i - n;
		}
	}

	printf("%d\n", nr);
	for(i = 1; i <= nr; i++)
		printf("%d ", l[i]);
	printf("\n");
	return 0;
}