大小写字母互换（1）
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说明
输入一个字符串，保证只有大写或小写字母，请你把大写字母变成小写字母，把小写字母变成大写字母，并输出。输入格式
一个字符串。输出格式
一个字符串。abcDEFGhABCdefgH
You cannot submit for this problem because the contest is ended. You can click "Open in Problem Set" to view this problem in normal mode.
abcDEFGhABCdefgH