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

[Q]: Sentence: 'a plane with smoke coming from the tips of both wings'. Find frequency of the letter 'c'
[A]: 1

[Q]: Sentence: 'silhouette of person playing frisbee with moutain and sunset'. Find frequency of the letter 'i'
[A]: 5

[Q]: Sentence: 'two young ladies are riding their horses on the beach'. Find frequency of the letter 'o'
[A]:
4