#include <bits/stdc++.h>
using namespace std;
vector<double> x, ans;
long long n;
void out(vector<long long> &a) {
  for (auto i : a) {
    cout << i << " ";
  }
}
bool check(double mid) {
  long long j = 0;
  for (long long i = 0; i < 3; i++) {
    if (j > n)
      ans[i] = x[n - 1] + mid;
    else
      ans[i] = x[j] + mid;
    while (j < n && x[j] <= ans[i] + mid) {
      j++;
    }
  }
  return j > n - 1;
}
signed main() {
  cout << fixed << setprecision(6);
  cin >> n;
  x.resize(n);
  ans.resize(3);
  for (long long i = 0; i < n; i++) {
    cin >> x[i];
  }
  sort(x.begin(), x.end());
  double l = 0, r = 1e9;
  double eps = 0.000001;
  while (r - l > eps) {
    double m = (l + r) / 2;
    if (check(m))
      r = m;
    else
      l = m;
  }
  check(r);
  cout << r << endl;
  for (long long i = 0; i < 3; i++) {
    cout << ans[i] << " ";
  }
}

### Prompt

Construct a Cpp code solution to the problem outlined:

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;
vector<double> x, ans;
long long n;
void out(vector<long long> &a) {
  for (auto i : a) {
    cout << i << " ";
  }
}
bool check(double mid) {
  long long j = 0;
  for (long long i = 0; i < 3; i++) {
    if (j > n)
      ans[i] = x[n - 1] + mid;
    else
      ans[i] = x[j] + mid;
    while (j < n && x[j] <= ans[i] + mid) {
      j++;
    }
  }
  return j > n - 1;
}
signed main() {
  cout << fixed << setprecision(6);
  cin >> n;
  x.resize(n);
  ans.resize(3);
  for (long long i = 0; i < n; i++) {
    cin >> x[i];
  }
  sort(x.begin(), x.end());
  double l = 0, r = 1e9;
  double eps = 0.000001;
  while (r - l > eps) {
    double m = (l + r) / 2;
    if (check(m))
      r = m;
    else
      l = m;
  }
  check(r);
  cout << r << endl;
  for (long long i = 0; i < 3; i++) {
    cout << ans[i] << " ";
  }
}

```