#include<bits/stdc++.h>
using namespace std;
int zhishu[25]={2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97};
char ch[27];
int a[27];
int main()
{
	int maxn=0,minn=100,t=0;
	string s;
	cin>>s;
	for(int i=1;i<=26;i++)
	{
		ch[i]=96+i;
	}
	for(int i=0;i<=s.length();i++)
	{
		for(int j=1;j<=26;j++)
		{
			if(s[i]==ch[j])
			{
				a[j]++;
			}
		}
	}
	for(int i=1;i<=26;i++)
	{
		maxn=max(a[i],maxn);
	}
	for(int i=1;i<=26;i++)
	{
		if(a[i]>0)
		{
			minn=min(a[i],minn);
		}
	}
	for(int i=0;i<=24;i++)
	{
		if(maxn-minn==zhishu[i])
		{
		    cout<<"Lucky Word"<<endl<<maxn-minn;
		    t=1;
		    break;
	    }
    } 
    if(t==0)
    {
		cout<<"No Answer"<<endl<<"0";
	}
	return 0;
}