instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a police officer who is riding on a horse'. Find frequency of the letter 'p'
answer:
1


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


question:
Sentence: 'a baguette with meat sits on a table'. Find frequency of the letter 'b'
answer:

2