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

Q: Sentence: 'a man in his car eating a donut'. Find frequency of the letter 'm'

A: 1
****
Q: Sentence: 'a gray elephant is in a grassy field'. Find frequency of the letter 'e'

A: 3
****
Q: Sentence: 'a cat laying under the covers in a bed'. Find frequency of the letter 'c'

A:
2
****