instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a snowboarder making a jump of a snowy ledge'. Find frequency of the letter 'o'
answer:
4


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 small dog laying next to a door'. Find frequency of the letter 'y'
answer:

1