Swap challenge

Question

You are given a string input,length 1<= n <= 10000, and you need to reverse each letter type

for example:

input: Hello
output: hELLO

input: 1He3llo4
output:1hE3LLO4

Any languages welcome

I will pin the first to do it in the least code(I've done it in one line, Python) and I will post my code after someone does it(or gets close to it)

Edit: Someone has done it, pinned his/her answer, now lets see who does it it the most complicated code

https://code.sololearn.com/cnZaLZS1KfN5/?ref=app

Answer 1

print( input().swapcase() )