Input
The input of the program will be only one sentence. The sentence will not contain punctuation marks, nor symbols different than letters. All letters will be uppercase.
Output
The program must output the decrypted sentence.
About statements
The official statement of a problem is always the one
in the PDF document. The HTML version of the statement
is also given to help you, but may contain some content
that is not well displayed. In case of doubt, always use the PDF.