In this task, you need to count the number of times the given letter appears in the given sentence.
--------
Question: Sentence: 'a group of cars and house on truck passing in a street'. Find frequency of the letter 'i'

Answer: 2


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

Answer: 6


Question: Sentence: 'a young woman sitting on a rock under an umbrella'. Find frequency of the letter 'a'

Answer:
5