instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a bus with two floors belonging to london country'. Find frequency of the letter 't'
answer:
4


question:
Sentence: 'there are two men sitting on a couch playing video games'. Find frequency of the letter 'v'
answer:
1


question:
Sentence: 'pedestrian passes next to a small display on the side of the street'. Find frequency of the letter 's'
answer:

8