Given a string consisting of decimal digits, ~0, 1, \cdots , 9~, such as ~122244~ and ~44444444444~, consider the following operation which produces from such a string a new string. The operation begins with reading the digits of the given string from left to right. If a digit, say ~a~, appears consecutively ~r~ times but not ~r+1~ times for some positive integer ~r~, then produce ~\bar{r}a~ without any space between digits, where ~\bar{r}~ is the string of digits representing integer ~r~ in decimal notation. Repeat this process on the remainning string (i.e., the substring of the given string beginninig from the ~r + 1~-st digit) until the remaining string become empty. By concatenating all the strings produced in this way during the course of processes, without any space between them, a new string of digits is produced. We count the whole course of processes for one application of the operation.

For example, from ~122244~ a new string ~\bar{1}1\bar{3}2\bar{2}4 = 113224~ is produced by one application of the operation, and from ~44444444444~ a new string ~114~. The operation may be applied repeatedly. Your task is to write a program which, given a string of digits of length less than or equal to ~100~, outputs a new string that is obtained from the string by applying the operation n times, where ~n \le 20~.

Input

The first line contains an integer ~n~, the number of times for the operation to be applied. The second line contains a string to receive the operation.

Output

The output file should contain a single line containing the new string produced by applying the operation ~n~ times.

Sample Input

5
11

Sample Output

13112221