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