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.
I=raw_input()
O=str()
list_upper="ABCDEFGHIJKLMNOPQRSTUVWXYZ"
#list_lower="abcdefghijklmnopqrstuvwxyz"
for i in I:
	if i in list_upper:
		O+=i.lower()
	else:
		O+=i.upper()
print O