Write a program which converts uppercase/lowercase letters to lowercase/uppercase for a given string.

Constraints

* The length of the input string < 1200

Input

A string is given in a line.

Output

Print the converted string in a line. Note that you do not need to convert any characters other than alphabetical letters.

Example

Input

fAIR, LATER, OCCASIONALLY CLOUDY.


Output

Fair, later, occasionally cloudy.
#coding:utf-8
#??????????????????????????§??§??????????°??????????????°????????????§???????????????????????????

text = list(raw_input())
for i in range(len(text)) :
	if ord(text[i])<=90 and ord(text[i])>=65:
		text[i] = chr(ord(text[i])+32)
	elif ord(text[i])<=122 and ord(text[i])>=97:
		text[i] = chr(ord(text[i])-32)
print(''.join(text))