标准代码

#include<bits/stdc++.h>
using namespace std;
int a[100];
bool is_prime(int n){
	if(n<=1) return false;
    //试除法
    for(int i=2;i*i<=n;i++){
    	if(n%i==0){
        	return false;
        }
    }
    return true;
}
int main(){
    string s;
    cin>>s;
    for(int i=0;i<s.size();i++){
        a[int(s[i])]++;
    }
    int maxn=0,minn=1000000;
    for(int i=97;i<=122;i++){
        if(a[i]!=0){
            if(a[i]>maxn){
                maxn=a[i];
            }
            if(a[i]<minn){
                minn=a[i];
            }
        }
    }
    if(is_prime(maxn-minn)){
        cout<<"Lucky Word"<<endl<<maxn-minn;
    }
    else{
        cout<<"No Answer"<<endl<<0;
        //cout<<maxn<<endl<<minn<<endl<<0;
    }
    return 0;
}