Question: Read a 3 - character string from input into variable inputString. Declare a Boolean variable isValid and assign isValid with true if inputString does not

Read a 3-character string from input into variable inputString. Declare a Boolean variable isValid and assign isValid with true if inputString does not contain any alphabetic characters. Otherwise, assign isValid with false.
Ex: If the input is 2&., then isValid is assigned with true, so the output is:
Valid string
Ex: If the input is 7y1, then isValid is assigned with false, so the output is:
Invalid string
Note: Use getline(cin, inputString) to read the entire line from input into inputString.

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