#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  int a, b, at = 1, ag = 1, bg = 2;
  cin >> a >> b;
  while (1) {
    if (at) {
      if (a < ag) {
        cout << "Vladik";
        return 0;
      }
      a -= ag;
      ag += 2;
    } else {
      if (b < bg) {
        cout << "Valera";
        return 0;
      }
      b -= bg;
      bg += 2;
    }
    at = !at;
  }
  return 0;
}
