#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);
    nr = 1000 < nr ? 1000 : nr;
    for(i = 1; i <= nr; i++)
        printf("%d ", l[i]);
    printf("\n");
    return 0;
}