How can I satisfy these two hints

Part II: A Pac-Man Puzzler (10 points) Pac-Man is a video game character who normally eats dots, power pellets, and the occasional ghost. Recently, he's fallen on hard times and has been reduced to (mainly) eating letters of the alphabet. Pac-Man can eat most letters of the alphabet, but he is unable to digest any of the characters in the word 'GHOST" (uppercase OR lowercase). When he reaches one of these characters in a string, he loses his appetite and stops eating Your job is to complete the pacmanO function, which traces Pac-Man's progress through a string of upperease and lowerease letters (with no spaces, digits, or symbols) and prints out the final state of the string. Use underscores () to represent consumed characters and a less-than sign (