#include <bits/stdc++.h>
using namespace std;
const int INF = 0x3f3f3f3f;
const int LINF = 0x3f3f3f3f3f3f3f3f;
template <typename T, typename U>
inline void amin(T &x, U y) {
  if (y < x) x = y;
}
template <typename T, typename U>
inline void amax(T &x, U y) {
  if (x < y) x = y;
}
int main() {
  ios::sync_with_stdio(false), cin.tie(0);
  long long a, b;
  cin >> a >> b;
  int k = 1;
  while (true) {
    if ((k & 1))
      a -= k;
    else
      b -= k;
    if (a < 0) {
      cout << "Vladik";
      return 0;
    } else if (b < 0) {
      cout << "Valera";
      return 0;
    }
    k++;
  }
}
