: Your scheme must contain unique codes for A-Z (all capital letters) and a space .
For example, if the input is the string "abc" , the output should be "bcd" . If the input is "cat" , the output should be "dbu" . This is often referred to as a "Caesar Cipher" with a shift of 1, though in this case, we apply the shift to the underlying ASCII values rather than just the alphabet.