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

[Q]: Sentence: 'an elephant has taken a man's hat in its trunk'. Find frequency of the letter 'p'
[A]: 1


[Q]: Sentence: 'the interior of a living and dining room'. Find frequency of the letter 'i'
[A]: 6


[Q]: Sentence: 'a white and green and pink plate and a cheese sandwich'. Find frequency of the letter 'r'
[A]:
1