In this task, you need to count the number of times the given letter appears in the given sentence.
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Question: Sentence: 'the receipts from a meal at a restaurant are for  a sandwich, chili, and apple'. Find frequency of the letter 'u'

Answer: 1


Question: Sentence: 'a man working on a small laptop on a wooden table'. Find frequency of the letter 'l'

Answer: 4


Question: Sentence: 'a cheese pizza, a bowl of soup, and a drink are on the table'. Find frequency of the letter 'n'

Answer:
3