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