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