#include <bits/stdc++.h>
using namespace std;
int ans = 0;
int main() {
  ios_base::sync_with_stdio(false);
  int a, b;
  cin >> a >> b;
  for (int i = 1;; i += 2) {
    a -= i;
    if (a < 0) {
      cout << "Vladik";
      return 0;
    }
    b -= i + 1;
    if (b < 0) {
      cout << "Valera";
      return 0;
    }
  }
  return 0;
}
