In this task, you need to count the number of times the given letter appears in the given sentence.

[Q]: Sentence: 'eight donuts are cooked together in oil in a metal tray'. Find frequency of the letter 'h'
[A]: 2


[Q]: Sentence: 'man in a sleeping bag on the floor using a laptop computer'. Find frequency of the letter 'i'
[A]: 3


[Q]: Sentence: 'a skateboarder doing a trick in the air'. Find frequency of the letter 'e'
[A]:
3