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.
s = raw_input()
ans = ""
for i in range(len(s)):
    if('A' <= s[i] and s[i] <= 'Z'):
        ans += s[i].lower()
    elif('a' <= s[i] and s[i] <= 'z'):
        ans += s[i].upper()
    else:
        ans += s[i]
print(ans)