instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a couple of men sitting next to each other under an umbrella'. Find frequency of the letter 'n'
answer:
5


question:
Sentence: 'a pizza is in a box on a table outside'. Find frequency of the letter 'u'
answer:
1


question:
Sentence: 'a market with grape, kiwi, apples, peaches, cantaloupe and a pumpkin'. Find frequency of the letter 'p'
answer:

7