instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'three birds are sitting on a tree in a forest'. Find frequency of the letter 'h'
answer:
1

question:
Sentence: 'pedestrians pass by a stop sign, some holding surfboards'. Find frequency of the letter 'n'
answer:
3

question:
Sentence: 'a photograph of a speed limit sign displaying "20 twenty's plenty."'. Find frequency of the letter 'd'
answer:
2