Problem:
Toggling Cases

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

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.

Constraints

The length of the input string < 1200

Sample Input

fAIR, LATER, OCCASIONALLY CLOUDY.

Sample Output

Fair, later, occasionally cloudy.

Solution in Python3 (judge verdict: Accepted)

s = input()
result = ''
for i, letter in enumerate(s):
    if letter.isupper():
        result += letter.lower()
    else:
        result += letter.upper()
print(result)