#include <bits/stdc++.h>
using namespace std;
int main() {
  long int vladik, valera;
  cin >> vladik;
  cin >> valera;
  for (int i = 0; i <= 1000000000; i++) {
    if (i % 2 != 0) {
      vladik -= i;
      if (vladik < 0) {
        cout << "Vladik";
        break;
      }
    } else {
      valera -= i;
      if (valera < 0) {
        cout << "Valera";
        break;
      }
    }
  }
  return 0;
}
