Question: Variable inputString is assigned with a 3 - character string read from input. If inputString's first, second, and third characters are all not digits, output

Variable inputString is assigned with a 3-character string read from input. If inputString's first, second, and third characters are all not digits, output "String is valid". Otherwise, output "String is not valid".
Ex 1: If the input is ffs, then the output is:
String is valid
Ex 2: If the input is k3w, then the output is:
String is not valid

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