#include <bits/stdc++.h>
using namespace std;

int n, x = 1;
map<string, int>a;
string c, b;
bool check(string c, string b) {
	long long d = 0, e = 0, f = 0, g = 0, h = 0;
	long long no = 0;
	char t;
	if (sscanf(b.c_str(), "%lld.%lld.%lld.%lld:%lld", &d, &e, &f, &g, &h) != 5) {
		return false;
	}
	if (d < 0 || e < 0 || f < 0 || g < 0 || h < 0 || d > 255 || f > 255 || e > 255 || g > 255 || h > 65535) {
		return false;
	}
	sscanf(b.c_str(), "%lld.%lld.%lld.%lld%c%lld", &no, &no, &no, &no, &t, &no);
	if (t != ':') {
		return false;
	}
	return true;
}

int main() {
	cin >> n;
	for (int i = 0; i < n; i++) {
		cin >> c >> b;
		if (c == "Server") {
			auto it = a.count(b);
			if (it == 0) {
				if (check(c, b)) {
					a.insert(pair<string, int>(b, x));
					x++;
					cout << "OK" << endl;
				} else {
					cout << "ERR" << endl;
				}
			} else {
				cout << "FAIL" << endl;
			}
		} else {
			if (check(c, b)) {
				auto it = a.find(b);
				auto it2 = a.count(b);
				if (it2 != 0) {
					cout << it->second << endl;
				} else {
					cout << "FAIL" << endl;
				}
			} else {
				cout << "ERR" << endl;
			}
		}
	}
	return 0;
}

求调