#include <bits/stdc++.h>
using namespace std;
const long long MOD = 1e9 + 7;
const long long INF = LLONG_MAX;
int main() {
  long long a, b;
  cin >> a >> b;
  int x = 1, flag;
  while (1) {
    if (a < 0) {
      flag = 1;
      break;
    }
    if (b < 0) {
      flag = 2;
      break;
    }
    a -= x;
    x++;
    b -= x;
    x++;
  }
  if (flag == 1) cout << "Vladik";
  if (flag == 2) cout << "Valera";
  return 0;
}
