instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a man sitting in front of a laptop computer next to a child'. Find frequency of the letter 'e'
answer:
2


question:
Sentence: 'a man flying through the air on a bicycle'. Find frequency of the letter 'u'
answer:
1


question:
Sentence: 'a parking lot has busses some double decker'. Find frequency of the letter 'k'
answer:

2