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