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 log in the water with three birds perched on it'. Find frequency of the letter 'r'
answer:
4

question:
Sentence: 'a woman that is standing in front of an oven'. Find frequency of the letter 'a'
answer:
5