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

[EX Q]: Sentence: 'group of cars on the road with the sun setting behind it'. Find frequency of the letter 'd'
[EX A]: 2

[EX Q]: Sentence: 'a woman is taking a sip of a drink from a glass'. Find frequency of the letter 'i'
[EX A]: 4

[EX Q]: Sentence: 'a woman hits a tennis ball with her racket'. Find frequency of the letter 'e'
[EX A]:
3