50分，求助

#include <bits/stdc++.h>
using namespace std;
int a[30];
string s;
int main()
{
	cin>>s;
	for(int i=0;i<s.size();i++)
		a[s[i]-'a'+1]++;
	int maxn=1,minn=100;
	for(int i=1;i<=26;i++)
	{
		maxn=max(maxn,a[i]);
		if(a[i]!=0 && a[i]<minn) minn=a[i];
	} 
	int x=maxn-minn;
	bool flag=1;
	for(int i=2;i*i<=x;i++)
	{
		if(x%i==0)
		{
			flag=0;
			break;
		}

	}
		if(x==0 || x==1)
		    flag=0;
	if(flag==1)
	{
		cout<<"Lucky Word"<<endl;
		cout<<x;
	}
	else
		cout<<"No Answer"<<endl;
		cout<<"0";
	return 0;
}