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

[EX Q]: Sentence: 'a close up of a plate with a whole carrot'. Find frequency of the letter 'w'
[EX A]: 2

[EX Q]: Sentence: 'the receipts from a meal at a restaurant are for a sandwich, chili, and apple'. Find frequency of the letter 'u'
[EX A]: 1

[EX Q]: Sentence: 'three men stand in front of the small airplane'. Find frequency of the letter 'o'
[EX A]:
2