#!usr/bin/env python 3

# You are given a string and your task is to swap cases. In other words, convert all lowercase letters to uppercase letters and vice versa.

# For Example:
# Www.HackerRank.com → wWW.hACKERrANK.COM
# Pythonist 2 → pYTHONIST 2

# Input Format
# A single line containing a string .

# Constraints
#0<len(s)<=100

# Output Format
# Print the modified string .

# Sample Input 0
# HackerRank.com presents "Pythonist 2".

# Sample Output 0
# hACKERrANK.COM PRESENTS "pYTHONIST 2".


n=(input())
print(n.swapcase())def swap_case(s):
    result=s.swapcase()
    return result

if __name__ == '__main__':
    s = input()
    result = swap_case(s)
    print(result)o

