please dont use loops or brackets. we have not reached this material in the class yet.

we only know if & if-else statements and i have already wasted an hour on this because im not sure what im getting wrong so any help is appreciated!

Read in a 3-character string from input into variable passCode. Declare a boolean variable isValid and set isValid to true if passCode only contains alphabetic characters. Otherwise, set isValid to false. Ex: If the input is zpk, then the output is: Passcode is valid Note: Use getline(cin, passCode) to read the entire line from input into passCode