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