#include <bits/stdc++.h>
using namespace std;
int main() {
  long long a, b, c = 0, d = 0, sum = 0, s = 0, x = 0, y = 0;
  cin >> a >> b;
  sum = a;
  s = b;
  if (b < 2) {
    cout << "Valera" << endl;
    return 0;
  }
  for (long long i = 1; i <= a; i += 2) {
    c++;
    sum = sum - i;
    if (sum == 0) {
      break;
    } else if (sum < 0) {
      c--;
      break;
    }
  }
  for (long long i = 2; i <= b; i += 2) {
    d++;
    s = s - i;
    if (s == 0) {
      break;
    } else if (s < 0) {
      d--;
      break;
    }
  }
  if (c == d) {
    cout << "Vladik" << endl;
  } else if (c > d) {
    cout << "Valera" << endl;
  } else {
    cout << "Vladik" << endl;
  }
}
