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