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