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

Solution (in CPP):

Solution:
#include <bits/stdc++.h>
using namespace std;
int n, x[200005];
double ans;
bool check(double k) {
  int tot = 0;
  double cnt = -1;
  for (int i = 0; i < n; i++) {
    if (x[i] > cnt) tot++, cnt = x[i] * 1.0 + k * 2;
  }
  return tot <= 3;
}
int main() {
  cin >> n;
  for (int i = 0; i < n; i++) cin >> x[i];
  sort(x, x + n);
  int l = 0, r = 1000000000, mid;
  while (l <= r) {
    mid = (l + r) / 2;
    if (check(mid * 0.5))
      ans = mid * 0.5, r = mid - 1;
    else
      l = mid + 1;
  }
  cout << fixed << setprecision(6) << ans << endl;
  double las, cnt = -1, tot = 0;
  for (int i = 0; i < n; i++) {
    if (x[i] > cnt) {
      tot++;
      cout << fixed << setprecision(6) << x[i] + ans << " ";
      las = x[i] + ans;
      cnt = x[i] * 1.0 + ans * 2;
    }
  }
  for (int i = 0; i < 3 - tot; i++)
    cout << fixed << setprecision(6) << las << " ";
  return 0;
}