instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'old double decker bus parked in a lot'. Find frequency of the letter 't'
answer:
1


question:
Sentence: 'a street at night with trees and streetlights on'. Find frequency of the letter 't'
answer:
9


question:
Sentence: 'two horses are on the grass by a horse trailer'. Find frequency of the letter 'o'
answer:

4