Question$3$: Hidden message

$(20$ points$)$

Write a code that takes a string as input and prints every third character using a loop.

$($if the string is "hello", the output is $"$l$",$ if the string is "buy milk", the output is $"$yi$")$

Test your code for these two cases:

a$)$ "aahaaeaalaapaa aamaae"

b$)"$ Iha e ao mea babddraaokkkeee"