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