2188 问题 R: Casear cypher

The casear cypher is an encryption method based on changing the letters in some text by a certain amount. For example if we shift each letter by 2, then all a's would be come c's all b's would become d's, all y's will become a's and all z's will become b's etc.
Write a program that reads some text that has been encoded using the Caesar cypher. This text will have been encoded using some shift between 1 and 25. Print the original text to the screen.

a single line of characters with length L (0<L<=2^10)

a single line of characters have been translated.

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