Homework assignment #6
Due date: see handout
Write a program that produces the same block letters as the program for Assignment #5 did. Now, however, the program should accept either uppercase or lowercase letters, e.,g., A or a
If the character read is not a letter, the program should reject it and print an error message, such as, input not a letter. The input should be a string of letters that end with a period, so that you can read them using a WHILE loop.