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

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


[Q]: Sentence: 'a person is performing a stunt on a snowboard'. Find frequency of the letter 'p'
[A]: 2


[Q]: Sentence: 'a computer and accessories are sitting on the ground'. Find frequency of the letter 'i'
[A]:
3