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 train station with a train pulling into the platform'. Find frequency of the letter 'i'
answer:
6


question:
Sentence: 'a dog laying on a sofa, sleeping next to a blanket'. Find frequency of the letter 'l'
answer:

3