instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a woman in a messy kitchen with a child'. Find frequency of the letter 'a'
answer:
4

question:
Sentence: 'a blue train on a track next to another track'. Find frequency of the letter 'c'
answer:
2

question:
Sentence: 'a group of people skiing down a snowy hill'. Find frequency of the letter 'o'
answer:
5