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

[EX Q]: Sentence: 'a stop sign next to houses with christmas lights'. Find frequency of the letter 's'
[EX A]: 7

[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: 'two red trains parked next to each other by some buildings'. Find frequency of the letter 't'
[EX A]:
5