#include <bits/stdc++.h>
#pragma comment(linker, '/STACK:256000000')
using namespace std;
int main() {
  int a[2];
  scanf("%d%d", &a[0], &a[1]);
  int n = 1;
  int cur = 0;
  while (true) {
    a[cur] -= n;
    if (a[cur] < 0) {
      printf(cur == 0 ? "Vladik" : "Valera");
      return 0;
    }
    cur = 1 - cur;
    n += 1;
  }
  return 0;
}
