#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);
  cout.tie(nullptr);
  cerr.tie(nullptr);
  int a, b;
  cin >> a >> b;
  int x = 0, y = 1;
  while (1) {
    if (x == 0) {
      a -= y;
      y++;
      if (a < 0) {
        cout << "Vladik\n";
        return 0;
      }
      x = 1;
    } else {
      b -= y;
      y++;
      x = 0;
      if (b < 0) {
        cout << "Valera\n";
        return 0;
      }
    }
  }
}
