#include<bits/stdc++.h>
#define ll long long
#define S "Server"
#define C "Client"
using namespace std;
int n;
struct cpt{
	string op;
	int a,b,c,d,e;
}a[1001];
map<string,int>mp;
void chan(string k,int x){
		int sum=0;
		int j=0;
		while(k[j]!='.'&&k[j]!=':'){
			sum=sum*10+k[j]-'0';
			j++;
		}
		a[x].a=sum;
		sum=0;
		j++;
		while(k[j]!='.'&&k[j]!=':'){
			sum=sum*10+k[j]-'0';
			j++;
		}
		a[x].b=sum;
		sum=0;
		j++;
		while(k[j]!='.'&&k[j]!=':'){
			sum=sum*10+k[j]-'0';
			j++;
		}
		a[x].c=sum;
		sum=0;
		j++;
		while(k[j]!='.'&&k[j]!=':'){
			sum=sum*10+k[j]-'0';
			j++;
		}
		a[x].d=sum;
		sum=0;
		j++;
		while(k[j]!='.'&&k[j]!=':'&&j<k.size()){
			sum=sum*10+k[j]-'0';
			j++;
		}
		a[x].e=sum;
}
bool check(int a){
	if(a>=256||a<0)return false;
	return true;
}
int main(){
	freopen("network.in","r",stdin);
	freopen("network.out","w",stdout);
	ios::sync_with_stdio(false) ;
	cin.tie(0);
	cout.tie(0);
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>a[i].op;
		string k;
		cin>>k;
		bool flag=0;
		int p=0;
		for(int i=0;i<k.size();i++){
			if(k[i]=='.')p++;
			if(p>3)flag=true;
			if(k[i]==':'&&p!=3)flag=true;
			if(!isdigit(k[i])&&k[i]!='.'&&k[i]!=':')flag=true;
			if(flag)break;
		}
		if(flag){
			cout<<"ERR"<<endl;
			continue;
		}
		chan(k,i);
		if(!(a[i].e<65536&&a[i].e>=0&&check(a[i].a)&&check(a[i].b)&&check(a[i].c)&&check(a[i].d))){
			cout<<"ERR"<<endl;
			continue;
		}
		if(a[i].op==C){
			if(mp[k])cout<<mp[k];
			else cout<<"FAIL";
		}
		else if(a[i].op==S){
			if(!mp[k]){
				mp[k]=i;
				cout<<"OK";
			}
			else if(mp[k])cout<<"FAIL";
		}
		cout<<endl;
	}
	
	return 0;
}