instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a couple of people that are on a baseball field'. Find frequency of the letter 'c'
answer:
1

question:
Sentence: 'two little girls playing with a bat and a tennis ball'. Find frequency of the letter 'w'
answer:
2

question:
Sentence: 'a person on skis standing on some snow'. Find frequency of the letter 's'
answer:
6