#include <iostream>
#include <cstdlib>
#include <cstdio>
#include <cstring>
#include <algorithm>
using namespace std;
int b[52]={0};
string Words;
bool is_prime(int n)
{
    if(n<2)
        return false;
    for (int i=2;i*i<=n;i++)
        {
        if(n % i == 0)
            return false;
        }
    return true;
}
int main()
{
    freopen("word.in","r",stdin);
    freopen("word.out","w",stdout);
    int a,c,d=0,j=0;
    cin>>Words;
    a=Words.size();
    for(int i=0;i<a;i++)
    {
        j=0;
        if(Words[i]<95)
        {
            j=Words[i]-32;
            b[j]++;
        }
        else
        {
            j=Words[i]-97;
            b[j]++;
        }
    }
    sort(b,b+52);
    for(int i=0;;i++)
    {
        if(b[i]!=0)
        {
            d=i;
            break;
        }
    }
    c=b[51]-b[d];
    if(is_prime(c))
    {
        cout<<"Lucky Word"<<endl<<c;
    }
    else
    {
        cout<<"No Answer"<<endl<<0;
    }
    return 0;
}