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

[Q]: Sentence: 'the skateboarder has on red and black sneakers and is riding a skateboard'. Find frequency of the letter 'g'
[A]: 1


[Q]: Sentence: 'a tv in a glass mirror in the bathroom'. Find frequency of the letter 'h'
[A]: 2


[Q]: Sentence: 'a group of people sitting and standing on a horse sleigh'. Find frequency of the letter 'p'
[A]:
3