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

[Q]: Sentence: 'man is snow gear and skis skiing in the snow'. Find frequency of the letter 'i'
[A]: 5


[Q]: Sentence: 'a girl hitting a tennis ball on a court'. Find frequency of the letter 'l'
[A]: 3


[Q]: Sentence: 'a book with a picture of a dog having a dog paw placed on it'. Find frequency of the letter 'h'
[A]:
2