#include <bits/stdc++.h>
using namespace std;
int main () {
    int N, M;
    cin >> N >> M;
    string ans = "";
    string key = "RGB";
    for (int i = 0; i < N + 3 - N % 3; i ++) {
        ans += key[i % 3];
    }
    vector<pair<int, char>> A(M);
    for (auto& [a, c] : A) {
        cin >> a >> c;
    }
    sort(A.begin(), A.end());
    for (auto [a, c] : A) {
        a --;
        if (a % 3 == 0) {
            if (c == 'G') {
                swap(ans[a], ans[a+1]);
            } else if (c == 'B') {
                swap(ans[a], ans[a + 2]);
            }
        } else if (a % 3 == 1) {
            if (ans[a + 1] == c) {
                swap(ans[a], ans[a + 1]);
            }
        }
    }
    cout << ans.substr(0, N) << endl;
}