#include <bits/stdc++.h>
using namespace std;
long long a, b, acu = 1;
bool res = true;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cin >> a >> b;
  while (res ? a >= acu : b >= acu) {
    if (res)
      a -= acu;
    else
      b -= acu;
    acu++;
    res ^= 1;
  }
  if (res)
    cout << "Vladik" << '\n';
  else
    cout << "Valera" << '\n';
  return 0;
}
