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: 'a row of vintage cars in a grassy field'. Find frequency of the letter 'v'
answer:
1


question:
Sentence: 'several mounted police on horses on a busy street'. Find frequency of the letter 'h'
answer:

1