#include <bits/stdc++.h>
using namespace std;
int main() {
  long a, b;
  cin >> a >> b;
  long i = 1;
  while (a >= 0 && b >= 0) {
    a -= i;
    if (a < 0) {
      cout << "Vladik\n";
      return 0;
    }
    b -= i + 1;
    if (b < 0) {
      cout << "Valera\n";
      return 0;
    }
    i += 2;
  }
  return 0;
}
