instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a person on a skateboard going down a ramp'. Find frequency of the letter 'n'
answer:
4


question:
Sentence: 'a woman walking on a shore next to a river'. Find frequency of the letter 'v'
answer:
1


question:
Sentence: 'a photo of one and a half cows standing in a field'. Find frequency of the letter 'a'
answer:

6