instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a young man riding a skateboard near a forest'. Find frequency of the letter 'd'
answer:
2


question:
Sentence: 'the large modern train is on the train track'. Find frequency of the letter 'm'
answer:
1


question:
Sentence: 'a snowboarder with tan pants going down a small hill'. Find frequency of the letter 'i'
answer:

3