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

[EX Q]: Sentence: 'some cubbies with towels in a blue bathroom'. Find frequency of the letter 'l'
[EX A]: 2

[EX Q]: Sentence: 'a doll with huge eyes and black hair with blunt bangs holds a red umbrella'. Find frequency of the letter 'e'
[EX A]: 5

[EX Q]: Sentence: 'a man is riding a bicycle through a crowded intersection'. Find frequency of the letter 'r'
[EX A]:
4