#include <array>
#include <iostream>
#include <vector>
using namespace std;

constexpr int N = 50;
                            // N  E  S   W
constexpr array<int, 4> dr = {-1, 0, 1,  0},
                        dc = { 0, 1, 0, -1};
vector<vector<vector<bool>>> seen;

void rec(int r, int c, int d, bool save) {
  if(save) { seen[r][c][d] = true; }
  string s; cin >> s;
  if(s[0] == 'M') { exit(0); }
  int dist = stoi(s);
  if(dist == 20151224) {
    cout << 'F' << endl;
    rec(r+dr[d], c+dc[d], d, true);
    return;
  }
  if(dist) {
    if(seen[r+dr[d]][c+dc[d]][d]) {
      int nd = (d + 1) % 4;
      cout << 'R' << endl;
      rec(r, c, nd, false);
    } else {
      cout << 'F' << endl;
      rec(r+dr[d], c+dc[d], d, true);
    }
    return;
  }
  int nd = (d + 1) % 4;
  cout << 'R' << endl;
  rec(r, c, nd, false);
}

int main(void) {
  seen.assign(N, vector<vector<bool>>(N, vector<bool>(4, false)));
  rec(N/2, N/2, 2, true);
  return 0;
}