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