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