#include <map>
#include <cstdio>
#include <cstring>
#include <iostream>
#include <cmath>
#include <algorithm>
#include <string>
using namespace std;
int n; // 需要进行连接的计算机数量
int server_num = 0; //服务器数量
string ip;
map<string, int>server;
/*
需要检查：
	1.".",":"的使用
	2.是否有前导零
	3.数字是否超限
*/

int checkDot(string s) { //该函数检查'.',':'的规范
//	cout << "checking dot..." << endl;
	int t_dot = 0;
	int len = s.length();
	for (int i = 0; i < len; i ++) {
		if (s[i] == '.') {
			t_dot++;
		} else if (s[i] == ':') {
			break;
		}
	}
	if (t_dot == 3) {
		return 1; //符合规范
	} else {
		return 0; //不符合规范
	}
}

int checkZero(string s) { //该函数用于检查是否有前导零
//	cout << "checking zero..." << endl;
	string temp = "";
	int i = 0;
	int sum = 0;
	for (int j = 0; j < 5; j++) {
		while (s[i] != '.' && s[i] != ':') { //还原每一个字串
			temp += s[i];
			i++;
		}
//		cout << "num" << j + 1  << " : " << temp << endl;
		if (temp.length() == 1) { //长度等于一了判断前导零没有必要
			sum++; //符合规范，计数器加一
		} else {
			if (temp[0] == '0') { //有前导零
				continue; //不符合规范，直接返回
			} else {
				sum++; //符合规范，计数器加一
			}
		}
		temp = ""; //初始化temp
		i++;
	}
	if (sum == 5) {
		return 1; //计数器等于子串个数，说明符合规范
	} else {
		return 0; //不符合，返回
	}

}

int checkEdge(string s) { //该函数用于检测每个字串数字大小是否符合规范
//	cout << "checking edge..." << endl;
	string temp = "";
	int sum = 0;
	int i = 0;
	for (int j = 0; j < 4; j++) {
		while (s[i] != '.' && s[i] != ':') { //还原每一个字串
			temp += s[i];
			i++;
		}
//		cout << "num" << j + 1 << " : " << temp << endl;
		int temp_1 = stoi(temp); //转换为整型
		if (temp_1 >= 0 && temp_1 <= 255) {
			sum++; //符合规范，计数器加一
		}
		temp = "";
		i++;
	}
	while (s[i] != '.' && s[i] != ':') { //还原端口字串
		temp += s[i];
		i++;
	}
	int temp_1 = stoi(temp);
	if (temp_1 >= 0 && temp_1 <= 65535) {
		sum++;
	}
	if (sum == 5) {
		return 1;
	} else {
		return 0;
	}
}


int checkIp(string ip) { //就是个中控台
	if (!checkDot(ip)) {
		return 0; //直接返回不符合规范
	}
	if (!checkZero(ip)) {
		return 0;
	}
	if (!checkEdge(ip)) {
		return 0;
	}
	return 1; //都符合规范
}

int check_if_server_in(string ip) {
	for (auto i = server.begin(); i != server.end(); i++) {
		if (i->first == ip) {
			return 0; //已经存在
		}
	}
	return 1; //没有存在
}
string t1;
string t2;

int main() {
	freopen("P7911_2.in", "r", stdin);
//	freopen("P")
	cin >> n;
	for (int i = 1; i <= n; i++) {
		cin >> t1;
//		getchar();
		cin >> t2;
//		getchar();
		if (!checkIp(t2)) {
			cout << "ERR" << endl;
			continue;
		}
		if (t1 == "Client") {
			int num = 0;
			for (auto i = server.begin(); i != server.end(); i++) {
				if (i->first == t2) {
					cout << server[t2] << endl;
				} else {
					num++;
				}
			}
			if (num == server_num) {
				cout << "FAIL" << endl;
			}
		} else {
			if (!check_if_server_in(t2)) {
				cout << "FAIL" << endl;
				continue;
			}
			server[t2] = i;
			server_num ++;
			cout << "OK" << endl;
		}
	}
	fclose(stdin);
	return 0;
}