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: 'one man grabbing another at a table while laughing'. Find frequency of the letter 'n'

Answer: 5


Question: Sentence: 'a group of workers washing and cleaning fruits and vegetables'. Find frequency of the letter 'i'

Answer: 3


Question: Sentence: 'a group of people with umbrellas walking on walkway'. Find frequency of the letter 'r'

Answer:
2