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

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

[EX Q]: Sentence: 'a couple of girls are hanging out at a restaurant'. Find frequency of the letter 'l'
[EX A]: 2

[EX Q]: Sentence: 'the small black and white dog holds onto a frisbee'. Find frequency of the letter 'h'
[EX A]:
3