#include <iostream>
#include <iomanip>
#include <vector>
#include <map>
#include <string>
#include <cstring>
#include <set>
#include <queue>
#include <stack>
#include <bitset>
#include <algorithm>
#include <cstdio>
#include <cstdlib>
#include <cmath>

using namespace std;

int main()
{
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);

    string as, bs;

    cin >> as >> bs;

    if (as.length() > bs.length())
    {
        cout << "0\n";
        return 0;
    }

    if (as.length() < bs.length())
    {
        cout << "Bad luck";
        return 0;
    }

    cout << "1\n";

    for (int i = 0; i < as.length(); i++)
        if (as[i] < bs[i])
        {
            cout << i + 1 << endl;
            return 0;
        }

    return 0;
}