题解

#include<bits/stdc++.h>
#define ll long long                                                        //防伪标识
#define MAXN 1005
#define maxn 10005
#define MAXM 10000
#define maxm 1000005
using namespace std;
int n;
int main(){
	cin>>n;
	if(n<7)cout<<"Acidic";
	else if(n == 7) cout<<"neutral";
	else cout<<"alkalinity";
	return 0;
}