#include <bits/stdc++.h>
using namespace std;
double a[200050];
int n;
bool check(double d) {
  int k = 0, k1 = 0;
  for (int i = 0; i < n; i++) {
    if (a[i] > a[0] + d) {
      k = i;
      break;
    }
  }
  for (int i = n - 1; i > 0; i--) {
    if (a[i] < a[n - 1] - d) {
      k1 = i;
      break;
    }
  }
  if (a[k1] - a[k] > d && k1 > k)
    return 1;
  else
    return 0;
}
int main() {
  cin >> n;
  for (int i = 0; i < n; i++) scanf("%lf", &a[i]);
  sort(a, a + n);
  double st = 0;
  double nd = 2 * 1e9 + 1000;
  for (int i = 0; i < 100; i++) {
    double mid = (st + nd) / 2;
    if (check(mid))
      st = mid;
    else
      nd = mid;
  }
  st = st / 2;
  cout << setprecision(8) << fixed << st << endl;
  int t = 0;
  cout << a[0] + st << " ";
  for (int i = 0; i < n; i++) {
    if (a[i] > a[0] + 2 * st + 0.0000001) {
      cout << a[i] + st << " ";
      t = 1;
      break;
    }
  }
  if (t == 0) {
    cout << a[0] + st << " ";
  }
  cout << a[n - 1] - st;
  return 0;
}

### Prompt

Create a solution in cpp for 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;
double a[200050];
int n;
bool check(double d) {
  int k = 0, k1 = 0;
  for (int i = 0; i < n; i++) {
    if (a[i] > a[0] + d) {
      k = i;
      break;
    }
  }
  for (int i = n - 1; i > 0; i--) {
    if (a[i] < a[n - 1] - d) {
      k1 = i;
      break;
    }
  }
  if (a[k1] - a[k] > d && k1 > k)
    return 1;
  else
    return 0;
}
int main() {
  cin >> n;
  for (int i = 0; i < n; i++) scanf("%lf", &a[i]);
  sort(a, a + n);
  double st = 0;
  double nd = 2 * 1e9 + 1000;
  for (int i = 0; i < 100; i++) {
    double mid = (st + nd) / 2;
    if (check(mid))
      st = mid;
    else
      nd = mid;
  }
  st = st / 2;
  cout << setprecision(8) << fixed << st << endl;
  int t = 0;
  cout << a[0] + st << " ";
  for (int i = 0; i < n; i++) {
    if (a[i] > a[0] + 2 * st + 0.0000001) {
      cout << a[i] + st << " ";
      t = 1;
      break;
    }
  }
  if (t == 0) {
    cout << a[0] + st << " ";
  }
  cout << a[n - 1] - st;
  return 0;
}

```