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

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


[Q]: Sentence: 'a person standing operating a cell phone in a room'. Find frequency of the letter 'n'
[A]: 6


[Q]: Sentence: 'the boys and girls are waiting for their awards'. Find frequency of the letter 'h'
[A]:
2