In this task, you need to count the number of times the given letter appears in the given sentence.
--------
Question: Sentence: 'a picture of two men on a motorcycle in front of a railroad track'. Find frequency of the letter 'n'

Answer: 4

Question: Sentence: 'a surfer wipes out on a huge wave'. Find frequency of the letter 'a'

Answer: 3

Question: Sentence: 'a room with a king sized bed and a painting'. Find frequency of the letter 'e'

Answer:
2