ABC's again

https://www.youtube.com/watch?v=dQw4w9WgXcQ

teacher: that's a sentence, but I'll give you credit. And what starts with the letter I?

igloo 9nfgjtghiogfgjgjggjngjknfknfnkfngkfknkfkfknkngkfjngkjgnkfgnkgnkngknknknknkngknknknknknknkngknknkngknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknknkn

teacher: what are you doing?!