instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'four women around a man sitting in front of a cake'. Find frequency of the letter 'o'
answer:
5

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

question:
Sentence: 'a professional baseball player stands at home plate with his bat'. Find frequency of the letter 'n'
answer:
2