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

[EX Q]: Sentence: 'a railroad train pulling up to the train platform'. Find frequency of the letter 'o'
[EX A]: 3

[EX Q]: Sentence: 'a guy riding a bike close to a car in the street'. Find frequency of the letter 'i'
[EX A]: 4

[EX Q]: Sentence: 'a large plane that is behind another plane on a run way area'. Find frequency of the letter 'h'
[EX A]:
3