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

[EX Q]: Sentence: 'a large bathroom with marble floor, counter, and bath'. Find frequency of the letter 'f'
[EX A]: 1

[EX Q]: Sentence: 'a man flying through the air on top of a skateboard'. Find frequency of the letter 'h'
[EX A]: 3

[EX Q]: Sentence: 'an adorable dog standing on top of a lawn chair next to a bbq with little hot dogs grilling on it'. Find frequency of the letter 't'
[EX A]:
9