#include <bits/stdc++.h>
using namespace std;
int n, x[200001];
int main() {
  scanf("%d", &n);
  for (int i = 0; i < n; i++) scanf("%d", &x[i]), x[i] *= 2;
  sort(x, x + n);
  int f = 0, l = x[n - 1];
  while (f <= l) {
    int m = (f + l) / 2, ct = 1, sv = x[0];
    for (int i = 0; i < n && ct <= 3; i++) {
      if (sv < x[i] - 2 * m) sv = x[i], ct++;
    }
    if (ct > 3)
      f = m + 1;
    else
      l = m - 1;
  }
  printf("%.6lf\n", 0.5 * f);
  int sv = x[0], ct = 1;
  printf("%.6lf", 0.5 * (x[0] + f));
  for (int i = 0; i < n; i++)
    if (sv < x[i] - 2 * f) sv = x[i], printf(" %.6lf", 0.5 * (sv + f)), ct++;
  while (ct < 3) printf(" %.6lf", 0.5 * (sv + f)), ct++;
  return 0;
}

### Prompt

Your challenge is to write 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 n, x[200001];
int main() {
  scanf("%d", &n);
  for (int i = 0; i < n; i++) scanf("%d", &x[i]), x[i] *= 2;
  sort(x, x + n);
  int f = 0, l = x[n - 1];
  while (f <= l) {
    int m = (f + l) / 2, ct = 1, sv = x[0];
    for (int i = 0; i < n && ct <= 3; i++) {
      if (sv < x[i] - 2 * m) sv = x[i], ct++;
    }
    if (ct > 3)
      f = m + 1;
    else
      l = m - 1;
  }
  printf("%.6lf\n", 0.5 * f);
  int sv = x[0], ct = 1;
  printf("%.6lf", 0.5 * (x[0] + f));
  for (int i = 0; i < n; i++)
    if (sv < x[i] - 2 * f) sv = x[i], printf(" %.6lf", 0.5 * (sv + f)), ct++;
  while (ct < 3) printf(" %.6lf", 0.5 * (sv + f)), ct++;
  return 0;
}

```