instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'small black bird with red on its head standing on a tree branch'. Find frequency of the letter 'b'
answer:
3


question:
Sentence: 'some cubbies with towels in a blue bathroom'. Find frequency of the letter 'l'
answer:
2


question:
Sentence: 'an office cubicle with a bunch of blue landscape photos'. Find frequency of the letter 'b'
answer:

3