instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'bathroom scene with a black cat going behind the door'. Find frequency of the letter 'e'
answer:
4


question:
Sentence: 'town clocks affixed to a tall, brick building'. Find frequency of the letter 'r'
answer:
1


question:
Sentence: 'a man is signing a bat in front of an at&t wall'. Find frequency of the letter 's'
answer:

2