instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a train going over a bridge with some buildings in the background'. Find frequency of the letter 'd'
answer:
3


question:
Sentence: 'a woman in a tank top reaches out for a frisbee'. Find frequency of the letter 'a'
answer:
6


question:
Sentence: 'two dogs are laying in a bed together'. Find frequency of the letter 'w'
answer:

1