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: 'a number of small boats on a beach near an umbrella'. Find frequency of the letter 's'

Answer: 2

Question: Sentence: 'a man riding on the back of a white horse next to other horses'. Find frequency of the letter 'o'

Answer: 6

Question: Sentence: 'a cat is curled up sleeping with the remote'. Find frequency of the letter 'e'

Answer:
6