instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'three young children playing with a ball in front of a huge bridge'. Find frequency of the letter 'e'
answer:
5


question:
Sentence: 'a couple of buildings that has a bus out front'. Find frequency of the letter 'a'
answer:
4


question:
Sentence: 'a white plate with a cut in half sandwich'. Find frequency of the letter 'e'
answer:

2