#include <bits/stdc++.h>
using namespace std;

int pi[4000003];///pi[i] = cel mai lung prefix propriu al sirului s(1..i) care este si sufix al sirului s(1..i)
int afis[1001];

char a[2000001], b[2000001];

string s;

int main()
{
    freopen("strmatch.in", "r", stdin);
	freopen("strmatch.out", "w", stdout);

	fgets(a, sizeof(a), stdin);
	fgets(b, sizeof(b), stdin);
	
    int cnt = 0;
    int na = strlen(a) - 1, nb = strlen(b) - 1;
    s += '$';
    for(int i = 0; i < na; i++)
        s += a[i];
    s += '$';
    for(int i = 0; i < nb; i++)
        s += b[i];
    for(int i = 2; i < s.size(); i++)
    {
        pi[i] = pi[i - 1];
        while(pi[i] && s[pi[i] + 1] != s[i])
            pi[i] = pi[pi[i]];
        if(s[pi[i] + 1] == s[i])
            pi[i]++;
    }
    for(int i = 1; i < s.size(); i++)
        if(pi[i] == na)
        {
            cnt++;
            if(cnt <= 1000)
                afis[cnt] = i - na + 1 - na - 2;
        }
    cout << cnt << '\n';
    for(int i = 1; i <= min(cnt, 1000); i++)
        cout << afis[i] << " ";
    return 0;
}