#include <bits/stdc++.h>
using namespace std;
void start() {}
int main() {
  start();
  int a, b;
  cin >> a >> b;
  int first, last;
  int flag = 0, temp = 0;
  for (int i = 1;; i += 2) {
    if (a < 0) break;
    a -= i;
    temp++;
  }
  for (int i = 2;; i += 2) {
    if (b < 0) break;
    b -= i;
    flag++;
  }
  if (flag < temp) {
    cout << "Valera";
  } else
    cout << "Vladik";
  return 0;
}
