instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a pizza is in a box on a table outside'. Find frequency of the letter 'u'
answer:
1


question:
Sentence: 'a man holding a frisbee high into the air'. Find frequency of the letter 'a'
answer:
4


question:
Sentence: 'a bathroom stall with a toilet and a tiled wall'. Find frequency of the letter 'o'
answer:

3