No.163 cAPSlOCK
yuki2006Problem Statement
Zelda set a password on her PC yesterday.
Today, she started up the PC and noticed that the password she entered yesterday does not let her in.
Thinking it over carefully, it seems she typed it with the Caps Lock feature on without noticing.
Apparently she did not notice while typing because the characters are hidden and displayed as *.
The password uses only the 52 kinds of half-width alphabet letters, uppercase and lowercase.
Caps Lock is a feature that makes typed letters be entered as uppercase if a lowercase letter is typed, and as lowercase if an uppercase letter is typed.
Given the string of the password she believes she entered yesterday,
find the "current" password that was mistakenly set.
Input
S
$S$ is given as a string consisting of the 52 kinds of half-width alphabet letters, lowercase or uppercase.
$1 \le |S| \le 100$
Output
Find the current password that was mistakenly set.
Print a newline at the end.
Sample
Sample 1
Input
CapsLock
Output
cAPSlOCK
Typing CapsLock with Caps Lock on gives this result.
The fact that the very reason for this key's existence is in question must not be touched upon, owing to the powers of darkness.
Incidentally, on a Mac, pressing Shift does not make letters lowercase.
Sample 2
Input
ABCdef
Output
abcDEF
Sample 3
Input
A
Output
a
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