#include<bits/stdc++.h>
using namespace std;
const int p[30]={2,3,5,7,11,13,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97};
int main(){
	string s;
	int sum[30]={};
	getline(cin,s);
	int maxx=-1,minn=26;
	int len=s.size();
	for(int i=0;i<len;i++){
		sum[s[i]-'a']++;
	}
	for(int i=0;i<26;i++){
		if(sum[i]>maxx) maxx=sum[i];
		if(sum[i]>0&&sum[i]<minn) minn=sum[i];
	}
	bool flag=0;
	for(int i=0;i<25;i++){
		if(maxx-minn==p[i]) flag=1;
	}
	if(flag==1){
		cout<<"Lucky Word"<<endl;;
		cout<<maxx-minn;
	}
	else if(flag==0){
		cout<<"No Answer"<<endl;
		cout<<0;
	}
	return 0;
}