#include <bits/stdc++.h>
using namespace std;
const int MAXN = 200001;
int n;
int cont;
double res[MAXN];
double num[MAXN];
bool Solve(double m) {
  cont = 0;
  for (int i = 0; i < n; i++) {
    int j = i;
    while (i < n && num[i] <= num[j] + m) i++;
    res[cont++] = min(num[j] + m, 1000000000.0);
    while (i < n && num[i] <= num[j] + m + m) i++;
    i--;
  }
  return cont <= 3;
}
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout << fixed << setprecision(6);
  cin >> n;
  for (int i = 0; i < n; i++) cin >> num[i];
  sort(num, num + n);
  double ini = 0.0, fin = 1000000000.0;
  for (int i = 0; i < 60; i++) {
    double med = (ini + fin) / 2;
    if (!Solve(med))
      ini = med + 1e-7;
    else
      fin = med;
  }
  for (int i = cont; i < n; i++) res[i] = res[i - 1];
  cout << ini << '\n';
  for (int i = 0; i < 3; i++) cout << res[i] << " ";
  cout << '\n';
  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;
const int MAXN = 200001;
int n;
int cont;
double res[MAXN];
double num[MAXN];
bool Solve(double m) {
  cont = 0;
  for (int i = 0; i < n; i++) {
    int j = i;
    while (i < n && num[i] <= num[j] + m) i++;
    res[cont++] = min(num[j] + m, 1000000000.0);
    while (i < n && num[i] <= num[j] + m + m) i++;
    i--;
  }
  return cont <= 3;
}
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout << fixed << setprecision(6);
  cin >> n;
  for (int i = 0; i < n; i++) cin >> num[i];
  sort(num, num + n);
  double ini = 0.0, fin = 1000000000.0;
  for (int i = 0; i < 60; i++) {
    double med = (ini + fin) / 2;
    if (!Solve(med))
      ini = med + 1e-7;
    else
      fin = med;
  }
  for (int i = cont; i < n; i++) res[i] = res[i - 1];
  cout << ini << '\n';
  for (int i = 0; i < 3; i++) cout << res[i] << " ";
  cout << '\n';
  return 0;
}

```