'How would I use python to print out alternating upper and lower case letters that the user has input?

I need to Convert all upper-case letters that are input by the user to print as lowercase letters, and I need all lower-case letters input by the user to print as upper-case letters, and i can't seem to figure out how to do it or why the commands work. I also need to put a random symbol between the letters and this is mainly the part that I am currently struggling with. Any help is appreciated!

python loops

Solution 1:^[1]

            print("Hello, World!")
            i =input()
            a= ""
            b="" 
            for Ih  in i:
              if Ih== Ih.upper():
                a+=Ih.lower ()
              elif Ih== Ih.lower():
                a+=Ih.upper() 
            print(a)
            for i in a :
                  b+=i+ "r" #insert random

Print out b and see the result!

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Solution 1	user18485167

'How would I use python to print out alternating upper and lower case letters that the user has input?

Solution 1:[1]

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Solution 1:^[1]