In this task, you need to count the number of times the given letter appears in the given sentence.
--------
Question: Sentence: 'a group of people standing on grass with a train in the background'. Find frequency of the letter 'n'

Answer: 6


Question: Sentence: 'a person dressed all in black snowboarding down a slope'. Find frequency of the letter 'e'

Answer: 4


Question: Sentence: 'there is a pizza in the plate on the table'. Find frequency of the letter 'p'

Answer:
2