#include<bits/stdc++.h>
#define ll long long
using namespace std;
const int N=1e4;
int n;
unordered_map<string,bool> m2;
unordered_map<string,int> m3;
inline int read(){
	int x=0,f=1;char ch=getchar();
	while (ch<'0'||ch>'9'){if (ch=='-') f=-1;ch=getchar();}
	while (ch>='0'&&ch<='9'){x=x*10+ch-48;ch=getchar();}
	return x*f;
}
int main(){
	cin>>n;
	for(int i=1;i<=n;i++){
		string s;
		bool cc=0;//=0是客户机，=1是服务机
		cin>>s;
		if(s[0]=='S') cc=1;
		else cc=0; 
		int a,b,c,d,e;
		char c1,c2,c3,c4;
		scanf("%d%c%d%c%d%c%d%c%d",&a,&c1,&b,&c2,&c,&c3,&d,&c4,&e);
		if(a>255||b>255||c>255||d>255||e>65535||c1!='.'||c2!='.'||c3!='.'||c4!=':'){
			cout<<"ERR\n";
			continue;
		}
		string ip=to_string(a)+"."+to_string(b)+"."+to_string(c)+"."+to_string(d)+":"+to_string(e);
		if(cc==1){
			if(m2[ip]==1){
				cout<<"FAIL\n";
			}else{
				m2[ip]=1;
				m3[ip]=i;
				cout<<"OK\n";
			}
			continue;
		}
		if(cc==0){
			if(m2[ip]==1){
				cout<<m3[ip]<<"\n";
			}else{
				cout<<"FAIL\n";
			}
		}
	}
	return 0;
}