instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a person riding a camel in front of a truck'. Find frequency of the letter 't'
answer:
2


question:
Sentence: 'some sheep are standing in a grassy field'. Find frequency of the letter 'n'
answer:
3


question:
Sentence: 'three brief cases sitting next to each other'. Find frequency of the letter 't'
answer:

6