#include <bits/stdc++.h>
using namespace std;
int main() {
  int n1, n2;
  cin >> n1 >> n2;
  for (int i = 1;; i++) {
    if (i % 2 != 0) {
      n1 -= i;
      if (n1 < 0) {
        cout << "Vladik" << endl;
        return 0;
      }
    } else {
      n2 -= i;
      if (n2 < 0) {
        cout << "Valera" << endl;
        return 0;
      }
    }
  }
}
