#include <bits/stdc++.h>
using namespace std;
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  long long aa, bb;
  cin >> aa >> bb;
  long long a = aa, b = bb;
  for (long long x = 1;; x++) {
    if (x % 2)
      a -= x;
    else
      b -= x;
    if (a < 0 or b < 0) {
      if (b < 0)
        cout << "Valera" << '\n';
      else
        cout << "Vladik" << '\n';
      break;
    }
  }
  return 0;
}
