instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'there is a zebra that is walking enar a car'. Find frequency of the letter 'r'
answer:
4


question:
Sentence: 'a man that is on his cell phone'. Find frequency of the letter 's'
answer:
2


question:
Sentence: 'two animals in the middle of a grassy, fenced in area'. Find frequency of the letter 'e'
answer:

5