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

[Q]: Sentence: 'a person is performing a stunt on a snowboard'. Find frequency of the letter 'p'
[A]: 2


[Q]: Sentence: 'a person riding a skate board on a city street'. Find frequency of the letter 'a'
[A]: 5


[Q]: Sentence: 'man standing in the middle of his living room looking over a mess of spilled items'. Find frequency of the letter 'h'
[A]:
2