instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a little boy standing near a couch and a table'. Find frequency of the letter 'i'
answer:
2


question:
Sentence: 'a bunch of broken down trains sit in a yard'. Find frequency of the letter 'n'
answer:
5


question:
Sentence: 'an image of a railroad track with train coming down'. Find frequency of the letter 'r'
answer:

4