#include <iostream>
using namespace std;

using u32 = uint32_t;

u32 uy = u32(time(NULL));
u32 xorshift32() {
  uy ^= uy << 14;
  uy ^= uy >> 13;
  uy ^= uy << 15;
  return uy;
}

inline u32 myhash(const string &s) {
  switch(s[0]) {
    case 'M':
      return 987'654'321U;
    default:
      switch(s.size()) {
        case 8:
          return 20151224U;
        default:
          return stoi(s);
      }
  }
  return -1;
}

int main(void) {
  cin.tie(nullptr); ios::sync_with_stdio(false);
  string s;
  for(;;) {
    getline(cin, s);
    switch(myhash(s)) {
      case 987'654'321U:
        return 0;
      case 20151224:
        cout << 'F' << endl;
        break;
      case 0:
        cout << "FLR"[xorshift32() % 2 + 1] << endl;
        break;
      default:
        cout << "FLR"[xorshift32() % 3] << endl;
        break;
    }
  }
  return 0;
}