give me proper full code and how to execute it

Adding the quotation marks without anything in them to yo number forces it to be a String. Assignment Portion - hand in once completed 4.20 (Pnocess a string) Write a program that prompts the user to cnter a string and displays its length and its last character. "4.15 (Phome key pods) The international standard letterumber mapping found on the telephone is shown below: Write a program that prompts the uwer to enter a lowercase or uppercase letser and displays its comesponding number. For a nonletter input, display invalid input