#include <bits/stdc++.h>
using namespace std;
int main(int argc, char *argv[]) {
  ios::sync_with_stdio(0);
  int a, b, sub = 1;
  bool chance = false;
  cin >> a >> b;
  while (a >= 0 && b >= 0) {
    if (!chance)
      a -= sub;
    else
      b -= sub;
    sub++;
    chance = !chance;
  }
  if (a >= 0)
    cout << "Valera" << endl;
  else
    cout << "Vladik" << endl;
  return 0;
}
