#include using namespace std; #define GET_MACRO(a, b, c, NAME, ...) NAME #define rep(...) GET_MACRO(__VA_ARGS__, rep3, rep2)(__VA_ARGS__) #define rep2(i, a) rep3 (i, 0, a) #define rep3(i, a, b) for (int i = (a); i < (b); i++) #define repr(...) GET_MACRO(__VA_ARGS__, repr3, repr2)(__VA_ARGS__) #define repr2(i, a) repr3 (i, 0, a) #define repr3(i, a, b) for (int i = (b) - 1; i >= (a); i--) template inline bool chmin(T1 &a, T2 b) { return b < a && (a = b, true); } template inline bool chmax(T1 &a, T2 b) { return a < b && (a = b, true); } using ll = long long; int parse(string s) { istringstream iss(s); int res; iss >> res; return res; } int input() { string s; cin >> s; return parse(s); } int y, x, d; bool vis[1000][1000]; int dy[] = {0, 1, 0, -1}; int dx[] = {1, 0, -1, 0}; void mov(string s) { cout << s << endl; if (s == "F") { y += dy[d]; x += dx[d]; } else if (s == "L") { d = (d + 3) % 4; } else if (s == "R") { d = (d + 1) % 4; } vis[y][x] = true; } bool rightvis() { int dd = (d + 1) % 4; return vis[y + dy[dd]][x + dx[dd]]; } int main() { y = 500; x = 500; d = 0; vis[y][x] = true; while (true) { string s; getline(cin, s); if (s == "Merry Christmas!") break; int x = parse(s); if (x > 0) { if (rightvis()) { mov("F"); } else { mov("R"); int y = input(); if (y == 0) { mov("L"); int z = input(); mov("F"); } else { mov("F"); } } } else { mov("R"); } } return 0; }