#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b, cnt = 1;
  cin >> a >> b;
  int d = a;
  bool flag = true;
  while (d >= cnt) {
    if (flag) {
      a -= cnt;
      flag = false;
      d = b;
    } else {
      b -= cnt;
      flag = true;
      d = a;
    }
    ++cnt;
  }
  if (a < cnt && flag)
    cout << "Vladik"
         << "\n";
  else
    cout << "Valera"
         << "\n";
  return 0;
}
