In this task, you need to count the number of times the given letter appears in the given sentence.
--------
Question: Sentence: 'some people sitting on surfboards in the water'. Find frequency of the letter 't'

Answer: 4

Question: Sentence: 'children with scissors and construction paper in a school classroom'. Find frequency of the letter 'c'

Answer: 6

Question: Sentence: 'a large clock on the corner of the sidewalk near a tree'. Find frequency of the letter 'f'

Answer:
1