#include <bits/stdc++.h>
int main() {
  int n, i, m = 0;
  scanf("%d", &n);
  char a[n + 2];
  scanf("%s", a);
  printf("%c%c", a[0], a[1]);
  if (n % 2) printf("%c", a[2]), m = 1;
  for (i = 2 + m; i < n; i += 2) printf("-%c%c", a[i], a[i + 1]);
}

### Prompt

In Cpp, your task is to solve the following problem:

Phone number in Berland is a sequence of n digits. Often, to make it easier to memorize the number, it is divided into groups of two or three digits. For example, the phone number 1198733 is easier to remember as 11-987-33. Your task is to find for a given phone number any of its divisions into groups of two or three digits.

Input

The first line contains integer n (2 ≤ n ≤ 100) — amount of digits in the phone number. The second line contains n digits — the phone number to divide into groups.

Output

Output any of divisions of the given phone number into groups of two or three digits. Separate groups by single character -. If the answer is not unique, output any.

Examples

Input

6
549871


Output

54-98-71

Input

7
1198733


Output

11-987-33

### Response

```cpp
#include <bits/stdc++.h>
int main() {
  int n, i, m = 0;
  scanf("%d", &n);
  char a[n + 2];
  scanf("%s", a);
  printf("%c%c", a[0], a[1]);
  if (n % 2) printf("%c", a[2]), m = 1;
  for (i = 2 + m; i < n; i += 2) printf("-%c%c", a[i], a[i + 1]);
}

```