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.
str = raw_input()
li = []

for c in list(str):
    if c.isupper():
        li.append(c.lower())
    elif c.islower():
        li.append(c.upper())
    else:
        li.append(c)
print ''.join(li)