Question: Read a 2 - character string from input into variable userString. Declare a Boolean variable isValid and assign isValid with true if userString does not

Read a 2-character string from input into variable userString. Declare a Boolean variable isValid and assign isValid with true if userString does not contain any lowercase letters. Otherwise, assign isValid with false.
Ex: If the input is 0J, then isValid is assigned with true, so the output is:
Valid string
Ex: If the input is dj, then isValid is assigned with false, so the output is:
Invalid string

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