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

Sentence: 'a large motorcycle that has a man dressed in old clothing next to it'. Find frequency of the letter 'a'
6

Sentence: 'two zebra stand near the wooden posts on a building'. Find frequency of the letter 't'
4

Sentence: 'a bus on a road next to some building'. Find frequency of the letter 'o'

4