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

[EX Q]: Sentence: 'a bus is stopped in front of a graphic statue'. Find frequency of the letter 'e'
[EX A]: 2

[EX Q]: Sentence: 'a train sits on a railroad track as a metal awning covers it'. Find frequency of the letter 'l'
[EX A]: 2

[EX Q]: Sentence: 'a tennis player wearing a t-shirt and a headband swings a tennis racket'. Find frequency of the letter 'h'
[EX A]:
2