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