instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'pedestrians pass by a stop sign, some holding surfboards'. Find frequency of the letter 'n'
answer:
3


question:
Sentence: 'a boy swinging a bat while playing baseball'. Find frequency of the letter 'h'
answer:
1


question:
Sentence: 'a dog on a couch near many pillows'. Find frequency of the letter 'p'
answer:

1