#include <bits/stdc++.h>
using namespace std;
int main() {
  long long a, b;
  cin >> a >> b;
  long i = 1;
  while (true) {
    if (i & 1)
      a -= i;
    else
      b -= i;
    if (a < 0) {
      cout << "Vladik" << endl;
      return 0;
    }
    if (b < 0) {
      cout << "Valera" << endl;
      return 0;
    }
    i++;
  }
  return 0;
}
