#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b;
  cin >> a >> b;
  int m1 = 1, m2 = 2, flag = 0;
  while (1) {
    if (a - m1 < 0) {
      flag = 1;
      break;
    }
    a -= m1;
    if (b - m2 < 0) {
      flag = 2;
      break;
    }
    b -= m2;
    m1 += 2;
    m2 += 2;
  }
  if (flag == 1)
    cout << "Vladik" << endl;
  else if (flag == 2)
    cout << "Valera" << endl;
}
