#include <bits/stdc++.h>
using namespace std;
const int maxN = 200 * 1000 + 5;
const int mod = 1000 * 1000 * 1000 + 7;
double a[maxN];
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  int n;
  cin >> n;
  for (int i = 0; i < n; i++) cin >> a[i];
  sort(a, a + n);
  double lo = 0, hi = 1e9 + 100;
  for (int t = 0; t < 500; t++) {
    double mid = (lo + hi) / 2;
    double val1 = a[0] + 2 * mid + 1e-9;
    int pos1 = upper_bound(a, a + n, val1) - a;
    double val2 = a[pos1] + 2 * mid + 1e-9;
    int pos2 = upper_bound(a, a + n, val2) - a;
    double val3 = a[pos2] + 2 * mid + 1e-9;
    int pos3 = upper_bound(a, a + n, val3) - a;
    if (pos3 == n || pos2 == n || pos1 == n)
      hi = mid;
    else
      lo = mid;
  }
  cout << fixed << setprecision(8);
  cout << lo << endl;
  double val1 = a[0] + 2 * lo + 1e-6;
  cout << a[0] + lo << ' ';
  int pos1 = upper_bound(a, a + n, val1) - a;
  double val2 = a[pos1] + 2 * lo + 1e-6;
  cout << a[pos1] + lo << ' ';
  int pos2 = upper_bound(a, a + n, val2) - a;
  cout << a[pos2] + lo << endl;
  return 0;
}

### 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;
const int maxN = 200 * 1000 + 5;
const int mod = 1000 * 1000 * 1000 + 7;
double a[maxN];
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  int n;
  cin >> n;
  for (int i = 0; i < n; i++) cin >> a[i];
  sort(a, a + n);
  double lo = 0, hi = 1e9 + 100;
  for (int t = 0; t < 500; t++) {
    double mid = (lo + hi) / 2;
    double val1 = a[0] + 2 * mid + 1e-9;
    int pos1 = upper_bound(a, a + n, val1) - a;
    double val2 = a[pos1] + 2 * mid + 1e-9;
    int pos2 = upper_bound(a, a + n, val2) - a;
    double val3 = a[pos2] + 2 * mid + 1e-9;
    int pos3 = upper_bound(a, a + n, val3) - a;
    if (pos3 == n || pos2 == n || pos1 == n)
      hi = mid;
    else
      lo = mid;
  }
  cout << fixed << setprecision(8);
  cout << lo << endl;
  double val1 = a[0] + 2 * lo + 1e-6;
  cout << a[0] + lo << ' ';
  int pos1 = upper_bound(a, a + n, val1) - a;
  double val2 = a[pos1] + 2 * lo + 1e-6;
  cout << a[pos1] + lo << ' ';
  int pos2 = upper_bound(a, a + n, val2) - a;
  cout << a[pos2] + lo << endl;
  return 0;
}

```