#include <bits/stdc++.h>
using namespace std;
void candy(int x, int y) {
  int d = 1;
  bool flag = true;
  while (x >= 0 && y >= 0) {
    if (flag) {
      x = x - d;
      d++;
      flag = false;
    } else {
      y = y - d;
      d++;
      flag = true;
    }
    if (flag == true && x < d) {
      cout << "Vladik" << endl;
      break;
    } else if (flag == false && y < d) {
      cout << "Valera" << endl;
      break;
    }
  }
}
int main(int argc, char** argv) {
  int a, b;
  cin >> a >> b;
  candy(a, b);
  return 0;
}
