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

Sentence: 'a large cooked pizza on a dining table'. Find frequency of the letter 'n'
3

Sentence: 'a tennis player after hitting a shot back to the other side of the court'. Find frequency of the letter 'n'
3

Sentence: 'a table with desserts, chips, drinks, cups, and paper towels on it'. Find frequency of the letter 'b'

1