#include <iostream>
#include <algorithm>
#include <string>
#include <map>
using namespace std;

bool isP(int x)
{
    if (i <= 1) return false;
    for (int i = 2;i * i <= x;i++)
    {
        if (x % i == 0) return false;
    }
    return true;
}
map <char, int> box;

int main()
{
    string s;
    cin >> s;
    for (int i = 0;i < s.size();i++) box[s[i]]++;
    
    int manx = 0, minn = 101;
    for (auto i : box)
    {
        maxn = max(maxn, box[i]);
        minn = min(minn, box[i]);
    }
    if (isP(maxn - minn)) cout << "Luck Word" << endl;
    else << "No Answer" << endl;
    return 0;
}