#include <bits/stdc++.h>
using namespace std;
int main(void) {
  int i, j, cnt = 1;
  int a, b;
  cin >> a >> b;
  while (1) {
    a -= cnt;
    if (a < 0) {
      printf("Vladik\n");
      break;
    }
    cnt++;
    b -= cnt;
    if (b < 0) {
      printf("Valera\n");
      break;
    }
    cnt++;
  }
  return 0;
}
