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

Q: Sentence: 'a couple of men sitting next to each other under an umbrella'. Find frequency of the letter 'n'

A: 5
****
Q: Sentence: 'a pizza is in a box on a table outside'. Find frequency of the letter 'u'

A: 1
****
Q: Sentence: 'an old bus is parked on what appears to be an old, broken down warehouse'. Find frequency of the letter 'p'

A:
3
****