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

[EX Q]: Sentence: 'town clocks affixed to a tall, brick building'. Find frequency of the letter 'r'
[EX A]: 1

[EX Q]: Sentence: 'a lady is standing near a luggage stand at the air port'. Find frequency of the letter 'a'
[EX A]: 9

[EX Q]: Sentence: 'a black steam engine sits on some train tracks on display'. Find frequency of the letter 'o'
[EX A]:
3