Read a $3-$character string from input into variable userString. Declare a Boolean variable isValid and assign isValid with true if userString only contains alphabetic characters. Otherwise, assign isValid with false.

Ex: If the input is ryp$,$ then isValid is assigned with true, so the output is:

String accepted

Ex: If the input is $0$wt$,$ then isValid is assigned with false, so the output is:

String not accepted

Note: Use getline$($cin$,$ userString$)$ to read the entire line from input into userString.