I got it close:

Build a character array in Python for the string "hellohackernews":

['h', 'e', 'l', 'l', 'o', 'h', 'a', 'c', 'k', 'e', 'r', 'n', 'e', 'w', 's']

Reverse the order of the python array characters:

['s', 'w', 'e', 'n', 'r', 'a', 'k', 'c', 'a', 'h', 'o', 'l', 'l', 'e', 'h']

Er, maybe not...

Reassemble the second array into a string without spaces:

"swenrakcaholles"