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.
slist = raw_input().split(" ")

new_str_list=[]
for s in slist:
    new_str = ""
    for c in s:
        if c.isupper():
            new_str += c.lower()
        else:
            new_str += c.upper()
    new_str_list.append(new_str)

print " ".join(new_str_list)