如题
#include<iostream>
#include<cstdio>
using namespace std;
int n;
struct node{
	string a,b;
	int u;
}a[1010];
int main(){
	freopen("network.in","r",stdin);
	freopen("network.out","w",stdout);
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>a[i].a>>a[i].b;
		if(a[i].a=="Server"){
			int f=0;
			for(int j=1;j<i;j++)
				if(a[i].b==a[j].b){
					f=1;
					break; 
				}
			if(f==1) cout<<"FAIL\n";
			else cout<<"OK\n";
		}
		else{
			int ans=0;
			for(int j=1;j<=i;j++){
				if(a[j].a=="Server" && a[j].b==a[i].b){
					ans=j;
					break; 
				} 
			}
			if(ans) cout<<ans<<endl;
			else cout<<"FAIL\n";
		}
	}
}