P6994 [NEERC 2014] Joke with permutation

Joey had saved a permutation of integers from $1$ to $n$ in a text file. All the numbers were written as decimal numbers without leading spaces. Then Joe made a practical joke on her: he removed all the spaces in the file. Help Joey to restore the original permutation after the Joe's joke!

The input file contains a single line with a single string -- the Joey's permutation without spaces. The Joey's permutation had at least $1$ and at most $50$ numbers.

Write a line to the output file with the restored permutation. Don’t forget the spaces! If there are several possible original permutations, write any one of them.

Time limit: 1 s, Memory limit: 256 MB. Thanks to checker provider:@[Arcturus1350 ](/user/57699).