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