instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'men are riding on motorcycles with a man riding in their carriers'. Find frequency of the letter 'r'
answer:
8


question:
Sentence: 'a bird in a tree looking up at branches'. Find frequency of the letter 'e'
answer:
3


question:
Sentence: 'ordering counter at the local doughnut shop and cafe'. Find frequency of the letter 'd'
answer:

3