#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b, n = 1;
  cin >> a >> b;
  while (a >= 0 && b >= 0) {
    if (n % 2)
      a -= n;
    else
      b -= n;
    n++;
  }
  if (a < 0)
    cout << "Vladik";
  else
    cout << "Valera";
  return 0;
}
