#include <cstdio>
#include <cstring>
using namespace std;

char sir[2000005], pattern[2000005];
int prefix[2000005] {}, rez[1005];

int main() {
    int lsir = 0, lpattern = 0, i = 0, j = 0, n = 0;
    freopen("strmatch.in", "r", stdin);
    freopen("strmatch.out", "w", stdout);

    scanf("%s%s", pattern, sir);
    lsir = strlen(sir);
    lpattern = strlen(pattern);

    for(i = lsir; i >= 1; --i)
        sir[i] = sir[i-1];
    for(i = lpattern; i >= 1; --i)
        pattern[i] = pattern[i-1];

    for(i = 2; i <= lpattern; ++i) {
        while(j && pattern[j + 1] != pattern[i])
            j = prefix[j];
        if(pattern[i] == pattern[j+1])
            ++j;
        prefix[i] = j;
    }

    j = 0;
    for(i = 1; i <= lsir; ++i) {
        while(j && sir[i] != pattern[j+1])
            j = prefix[j];
        if(sir[i] == pattern[j+1])
            ++j;
        if(j == lpattern) {
            j = prefix[j];
            rez[++n] = i - lpattern;
        }
    }

    printf("%d\n", n);
    n = (n < 1000 ? n : 1000);
    for(i = 1; i <= n; ++i)
        printf("%d ", rez[i]);
    printf("\n");
}