#include<iostream>
#include<string>
#include<cstring>
using namespace std;
const int inf = 1e8;
const int maxn = 26 + 10;
int small[maxn];
bool isPrime(int x){
    if(x == 1) return false;
    for(int i = 2; i * i <= x; i++){
        if(x % i == 0) return false;
    }
    return true;
}
int main(){
    string s; cin >> s;
    int mx = -inf, mi = inf;
    int len = s.length();
    for(int i = 0; i < len; i++) small[s[i] - 'a']++;
    for(int i = 0; i < 25; i++){
        mx = max(mx, small[i]);
        mi = min(mi, small[i]);
    }
    mi = max(mi, 1);
    int k = mx - mi;
    if(isPrime(k)){
        cout << "Lucky Word\n";
        cout << k << "\n";
    } else{
        cout << "NO Answer\n0\n";
    }
    return 0;
}