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

Q: Sentence: 'a giraffe shares a habitat with a zebra, an ostrich, and an okapi'. Find frequency of the letter 'e'

A: 3
****
Q: Sentence: 'a man swinging a bat while playing baseball'. Find frequency of the letter 'm'

A: 1
****
Q: Sentence: 'an old delivery truck that is rusted and broken down'. Find frequency of the letter 'r'

A:
4
****