#include <bits/stdc++.h>
using namespace std;
int arr[200005];
double p[4];
int n;
bool isok(double x) {
  double start = arr[0] + x;
  p[0] = start;
  int curr = 1;
  int index = 1;
  while (index < n) {
    if (arr[index] > start + x) {
      start = arr[index] + x;
      p[curr++] = start;
    }
    index++;
    if (curr == 4) {
      return false;
    }
  }
  return true;
}
void solve() {
  cin >> n;
  for (int i = 0; i < n; i++) cin >> arr[i];
  sort(arr, arr + n);
  double l = 0, r = 1e9;
  int time = 100;
  double mid;
  while (time--) {
    mid = (l + r) / 2;
    if (isok(mid)) {
      r = mid;
    } else {
      l = mid;
    }
  }
  cout << fixed << setprecision(6);
  cout << r << "\n";
  cout << p[0] << " " << p[1] << " " << p[2] << "\n";
}
int main() {
  ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
  int t = 1;
  while (t--) {
    solve();
  }
}

### Prompt

Please formulate a CPP solution to the following problem:

The New Vasjuki village is stretched along the motorway and that's why every house on it is characterized by its shift relative to some fixed point — the xi coordinate. The village consists of n houses, the i-th house is located in the point with coordinates of xi.

TELE3, a cellular communication provider planned to locate three base stations so as to provide every house in the village with cellular communication. The base station having power d located in the point t provides with communication all the houses on the segment [t - d, t + d] (including boundaries).

To simplify the integration (and simply not to mix anything up) all the three stations are planned to possess the equal power of d. Which minimal value of d is enough to provide all the houses in the village with cellular communication.

Input

The first line contains an integer n (1 ≤ n ≤ 2·105) which represents the number of houses in the village. The second line contains the coordinates of houses — the sequence x1, x2, ..., xn of integer numbers (1 ≤ xi ≤ 109). It is possible that two or more houses are located on one point. The coordinates are given in a arbitrary order.

Output

Print the required minimal power d. In the second line print three numbers — the possible coordinates of the base stations' location. Print the coordinates with 6 digits after the decimal point. The positions of the stations can be any from 0 to 2·109 inclusively. It is accepted for the base stations to have matching coordinates. If there are many solutions, print any of them.

Examples

Input

4
1 2 3 4


Output

0.500000
1.500000 2.500000 3.500000


Input

3
10 20 30


Output

0
10.000000 20.000000 30.000000


Input

5
10003 10004 10001 10002 1


Output

0.500000
1.000000 10001.500000 10003.500000

### Response

```cpp
#include <bits/stdc++.h>
using namespace std;
int arr[200005];
double p[4];
int n;
bool isok(double x) {
  double start = arr[0] + x;
  p[0] = start;
  int curr = 1;
  int index = 1;
  while (index < n) {
    if (arr[index] > start + x) {
      start = arr[index] + x;
      p[curr++] = start;
    }
    index++;
    if (curr == 4) {
      return false;
    }
  }
  return true;
}
void solve() {
  cin >> n;
  for (int i = 0; i < n; i++) cin >> arr[i];
  sort(arr, arr + n);
  double l = 0, r = 1e9;
  int time = 100;
  double mid;
  while (time--) {
    mid = (l + r) / 2;
    if (isok(mid)) {
      r = mid;
    } else {
      l = mid;
    }
  }
  cout << fixed << setprecision(6);
  cout << r << "\n";
  cout << p[0] << " " << p[1] << " " << p[2] << "\n";
}
int main() {
  ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
  int t = 1;
  while (t--) {
    solve();
  }
}

```