(C ++ and STRING ONLY !!! no jave , no cstring, and no vector please )

Write a program that reads in a line of text and outputs the line with all the digits in all integer numbers replaced with 'x'. For example,

Input:

My userID is john17 and my 4 digit pin is 1234 which is secret.

Output:

My userID is john17 and my x digit pin is xxxx which is secret.

Note that if a digit is part of a word, then the digit is not changed to an 'x'.

For example, note that john17 is NOT changed to johnxx. Include a loop that allows the user to repeat this calculation again until the user says she or he wants to end the program.

Requirement: Read one line - extract each word - validate word to see if all digits - If all digits use erase word from the line, create new word with x and insert it in the same location - Otherwise no changes - Keep in mind you need to keep track of two space positions for each side of your word, except the last one which will have the end of line (use length())