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

[Q]: Sentence: 'the small black and white dog holds onto a frisbee'. Find frequency of the letter 'h'
[A]: 3


[Q]: Sentence: 'bathroom scene with a black cat going behind the door'. Find frequency of the letter 'e'
[A]: 4


[Q]: Sentence: 'tennis player being attentive, for the ball coming'. Find frequency of the letter 'e'
[A]:
6