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

Sentence: 'a black cat laying down on a bed'. Find frequency of the letter 'y'
1

Sentence: 'a group of people seated in chairs together and facing the same direction, with one man holding a soccer ball in his hands'. Find frequency of the letter 'm'
2

Sentence: 'a bunch of bananas hanging from a stem'. Find frequency of the letter 'b'

2