#include <bits/stdc++.h>
using namespace std;
long long int gcd(long long int a, long long int b) {
  return (a ? gcd(b % a, a) : b);
}
long long int modPow(long long int x, long long int n, long long int MOD) {
  long long int res = 1;
  while (n > 0) {
    if (n % 2 == 1) {
      res = (res * x) % MOD;
    }
    n /= 2;
    x = (x * x) % MOD;
  }
  return res;
}
long long int modInverse(long long int a, long long int p) {
  return modPow(a, p - 2, p);
}
int main() {
  ios_base::sync_with_stdio(false);
  long long int a, b, c = 1, f = 0;
  cin >> a >> b;
  while (true) {
    if (a >= c && f == 0) {
      f = 1;
      a -= c;
      c++;
    } else if (f == 0 && a < c)
      break;
    else if (f == 1 && b >= c) {
      f = 0;
      b -= c;
      c++;
    } else if (f == 1 && b < c)
      break;
  }
  if (f == 0)
    cout << "Vladik";
  else
    cout << "Valera";
}
