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

Q: Sentence: 'man is snow gear and skis skiing in the snow'. Find frequency of the letter 'i'

A: 5
****
Q: Sentence: 'two people are riding on canoes down a river'. Find frequency of the letter 'e'

A: 5
****
Q: Sentence: 'a person who is in the process of using a laptop'. Find frequency of the letter 'r'

A:
2
****