instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a grey hummingbird by fence and tree branches'. Find frequency of the letter 'y'
answer:
2

question:
Sentence: 'an elephant has taken a man's hat in its trunk'. Find frequency of the letter 'p'
answer:
1

question:
Sentence: 'a man jumping in the air on a skateboard'. Find frequency of the letter 'i'
answer:
3