Java BufferedReader / BufferedWriter#10604
Text is given. Read the text and convert each letter 'a' to 'b' and 'b' to 'a'. Uppercase letter must be changed to uppercase letter. Lowercase letter must be changed to lowercase letter.
Text - sequence of letters.
Print text where 'a' is changed to 'b' and 'b' is changed to 'a'.
Example 1