#include "testlib.h"

#include <bits/stdc++.h>

using namespace std;

int main(int argc, char **argv) {
    registerTestlibCmd(argc, argv);

    int n = inf.readInt();
    string outs = ouf.readString();
    string anss = ans.readString();

    if (outs != anss) {
        quitf(_wa, "yes/no differs");
    }

    if (outs == "YES") {
        vector<int> s1, s2, s3;

        for (int i = 1; i <= n; i++) {
            int x = ouf.readInt(1, n), y = ouf.readInt(1, n);
            s1.push_back(x);
            s2.push_back(y);
            s3.push_back(abs(x - y));
        }

        sort(s1.begin(), s1.end());
        sort(s2.begin(), s2.end());
        sort(s3.begin(), s3.end());

        for (int i = 1; i < n; i++) {
            if (s1[i] == s1[i - 1]) quitf(_wa, "x coord same");
        }
        for (int i = 1; i < n; i++) {
            if (s2[i] == s2[i - 1]) quitf(_wa, "y coord same");
        }
        for (int i = 1; i < n; i++) {
            if (s3[i] == s3[i - 1]) quitf(_wa, "|x-y| same");
        }
    }

    quit(_ok, "");

    return 0;
}