instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'two metal  benches on an empty train platform'. Find frequency of the letter 'n'
answer:
4


question:
Sentence: 'a man with headphones on is hunched over a sink while being recorded'. Find frequency of the letter 'd'
answer:
4


question:
Sentence: 'a woman in a brown jacket and her cellphone'. Find frequency of the letter 'l'
answer:

2