Software Engineer

Bob is a student and learned about alphabets and prime numbers today. He still sometimes gets confused between normal numbers and prime numbers. So his teacher thought of giving him a fun game that can help him to get confident in this topic.

The game was, there is string ‘STR’ of length ‘N’ which includes alphabets and digits. There is also a special character ‘K’. The game was to replace every prime number that occurred in the string ‘STR’ with ‘K’.

Bob has solved the task and finished the game, but he still has doubt that the final string he got after the replacement is correct. So being his friend he asked you to help him with it.

So your task is to play the same game and return the correct final string after replacement.

NOTE: 1 is neither prime nor composite.

EXAMPLE :

Input: ‘N’ = 8, 'K' = ?, ‘STR’ = A12a3CbB

Output: A1?a?CbB
In this case, the numbers are ‘1’, ‘2’, and ‘3’ at ‘2nd’, ‘3rd’, and ‘5th’ positions respectively (1-based indexing). But only ‘2’ and ‘3’ are prime numbers, So after replacing them with ‘K’ the final string will be “A1?a?CbB”.

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