#include <bits/stdc++.h>

using namespace std;

char p[2000010], s[2000010];
int v[2000010];

int main()
{
    freopen("strmatch.in", "r", stdin);
    freopen("strmatch.out", "w", stdout);
    scanf("%s%s", p, s);
    int n = strlen(s);
    int m = strlen(p);
    int q = -1;
    v[0] = -1;
    for(int i = 1; i < m; i++)
    {
        while(q != -1 && p[q + 1] != p[i])
            q = v[q];
        if(p[q + 1] == p[i])
            q++;
        v[i] = q;
    }
    int rez[1005], lr = 0;
    q = -1;
    for(int i = 0; i < n; i++)
    {
        while(q != -1 && p[q + 1] != s[i])
            q = v[q];
        if(p[q + 1] == s[i])
            q++;
        if(q == m - 1)
        {
            if(lr < 1000)
                rez[lr] = i - m + 1;
            lr++;
        }
    }
    printf("%d\n", lr);
    for(int i = 0; i < min(1000, lr); i++)
        printf("%d ", rez[i]);
    return 0;
}