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