Write a function swapcase(str) that convert the lowercase and uppercase letters in a string. For example, if the input is

Hello World 

Then your function should return the string

hELLO wORLD 

The function should ignore numbers if the input is

cse1010 

The output should be

CSE1010

in python

def swapcase(str): result = "" for x in str: if x.isupper(): result += x.lower() else: result += x.upper() return result

if __name__ == '__main__': user_string = input() print(swapcase(user_string)) I tried this and it didn't work