#include <bits/stdc++.h>
using namespace std;
const int MAXN = 2 * 100000 + 5;
int n;
long long t[MAXN];
long long res[3];
bool f(long long d) {
  long long prev = 0;
  int j = 0;
  for (int i = 0; i < n; i++) {
    if (t[i] > prev) {
      prev = t[i] + 2 * d;
      res[j++] = t[i] + d;
    }
    if (j > 3) return false;
  }
  while (j < 3) {
    res[j] = res[j - 1];
    j++;
  }
  return true;
}
int main() {
  scanf("%d", &n);
  for (int i = 0; i < n; i++) {
    scanf("%lld", &t[i]);
    t[i] *= 2;
  }
  sort(t, t + n);
  long long l = 0;
  long long r = t[n - 1];
  while (l < r) {
    long long m = (l + r) / 2;
    if (f(m))
      r = m;
    else
      l = m + 1;
  }
  f(l);
  printf("%.6lf\n", double(l) / 2);
  for (int i = 0; i < 3; i++) printf("%.6lf ", double(res[i]) / 2);
  printf("\n");
}

### Prompt

Please create a solution in cpp 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;
const int MAXN = 2 * 100000 + 5;
int n;
long long t[MAXN];
long long res[3];
bool f(long long d) {
  long long prev = 0;
  int j = 0;
  for (int i = 0; i < n; i++) {
    if (t[i] > prev) {
      prev = t[i] + 2 * d;
      res[j++] = t[i] + d;
    }
    if (j > 3) return false;
  }
  while (j < 3) {
    res[j] = res[j - 1];
    j++;
  }
  return true;
}
int main() {
  scanf("%d", &n);
  for (int i = 0; i < n; i++) {
    scanf("%lld", &t[i]);
    t[i] *= 2;
  }
  sort(t, t + n);
  long long l = 0;
  long long r = t[n - 1];
  while (l < r) {
    long long m = (l + r) / 2;
    if (f(m))
      r = m;
    else
      l = m + 1;
  }
  f(l);
  printf("%.6lf\n", double(l) / 2);
  for (int i = 0; i < 3; i++) printf("%.6lf ", double(res[i]) / 2);
  printf("\n");
}

```