Question: A 3 - character string, inString, is read from input. Replace the first and second characters in inString with ' ! ' only if both

A 3-character string, inString, is read from input. Replace the first and second characters in inString with '!' only if both are digit characters. Otherwise, inString is not changed.
Ex: If the input is 94j, then the output is:
!!j
Ex: If the input is 7xj, then the output is:
7xj

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