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: 'person wearing all white leaned up against a wall with a yellow sign'. Find frequency of the letter 'a'

Answer: 8

Question: Sentence: 'a snowboarder making a jump of a snowy ledge'. Find frequency of the letter 'o'

Answer: 4

Question: Sentence: 'a man prepares to through a frisbee while another man watches'. Find frequency of the letter 'r'

Answer:
5