#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, m;
  cin >> n >> m;
  int keep = 1;
  while (1) {
    if (keep % 2 == 1) {
      if (keep > n) {
        cout << "Vladik" << endl;
        return 0;
      } else
        n -= keep++;
    } else {
      if (keep > m) {
        cout << "Valera" << endl;
        return 0;
      } else
        m -= keep++;
    }
  }
  return 0;
}
