#include <bits/stdc++.h>
int main() {
  int vladik, valera;
  std::cin >> vladik >> valera;
  int vladik_rounds = sqrt(vladik);
  int valera_rounds = valera > vladik_rounds ? sqrt(valera - vladik_rounds) : 0;
  if (valera_rounds >= vladik_rounds) {
    std::cout << "Vladik\n";
  } else {
    std::cout << "Valera\n";
  }
  return 0;
}
