Read a $2-$character string from input into variable inString. Declare a Boolean variable noDuplicates and assign noDuplicates with true if the following conditions are met:

inString does not contain two of the same character.

For alphabetic characters, inString does not contain two of the same letter $($regardless of case$).$

Otherwise, assign noDuplicates with false.

Ex: If the input is $5!,$ then noDuplicates is assigned with true, so the output is:

String is valid

Ex: If the input is Cc$,$ then noDuplicates is assigned with false, so the output is:

String is not valid

Note: Use getline$($cin$,$ inString$)$ to read the entire line from input into inString. c$++$ simple