#include <bits/stdc++.h>

using namespace std;

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    string a[2] = {"L","R"}, s;
    int t = 1, x, f = 0, c = 0;
    while (cin >> x) {
        if (x) {
            if (x > 20) {
                cout << "F" << endl;
                break;
            }
            if (f) {
                cout << a[1 - t] << endl;
                cin >> x;
                if (x > 20) {
                    cout << "F" << endl;
                    break;
                } else {
                    cout << a[t] << endl;
                    cin >> x;
                }
            }
            cout << "F" << endl;
        } else {
            if (f) {
                cout << a[1 - t] << endl;
                cin >> x;
                if (x > 20) {
                    cout << "F" << endl;
                    break;
                } else {
                    cout << a[t] << endl;
                    cin >> x;
                }
            }
            cout << a[t] << endl;
            if (c) {
                cin >> x;
                cout << a[t] << endl;
                c = 0;
            } else {
                c++;
            }
            f = 1;
        }          
    }
    while (cin >> s) {
        if (s[0] == 'M') break;
        else {
            cout << "F" << endl;
        }
    }
    return 0;
}