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

Sentence: 'some food on plates next to each other on a table'. Find frequency of the letter 'e'
6

Sentence: 'a person with some scissors over a bowl'. Find frequency of the letter 's'
6

Sentence: 'a man holding a white frisbee while standing in a field'. Find frequency of the letter 'a'

5