In this task, you need to count the number of times the given letter appears in the given sentence.

Q: Sentence: 'a picture of two men on a motorcycle in front of a railroad track'. Find frequency of the letter 'n'

A: 4
****
Q: Sentence: 'a bowl of granola, dried fruit, and bananas'. Find frequency of the letter 'u'

A: 1
****
Q: Sentence: 'a subway sitting at a station waiting for people to board'. Find frequency of the letter 'a'

A:
7
****