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