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