Linya want's to write a secret letter to his friend. Linya encodes the letter by reverse each word, and transforms lowercase to uppercase and uppercase to lowercase. For example, "Dear my friend, how do you do!" is encoded to "RAEd YM DNEIRF, WOH OD UOY OD!".

Now, you are asked to help Linya to encode his letter. A word is a sequence of alphabets A-Z a-z , digits 0-9 , underscore _ , or apostrophe ' .

Linya想要給他的朋友寫一封秘密信。 Linya通過反轉每個單詞的字母進行編碼，並將小寫字母轉換為大寫字母，將大寫字母轉換為小寫字母。 例如，“Dear my friend, how do you do!” 編碼為“RAEd YM DNEIRF，WOH OD UOY OD！”。

現在，你被要求幫助Linya編碼他的信件。 單詞是字母A-Z a-z，數字0-9，下劃線_或撇號'的序列。