11121.cpp

#include <iostream>
using namespace std;
int main() {
	cin.tie(0);
	std::ios_base::sync_with_stdio(0);

	int n;
	cin >> n;
	while (n--) {
		string a, b;
		cin >> a >> b;
		cout << ((a == b) ? "OK\n" : "ERROR\n");
	}
}