instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a doorway looking into a small bathroom with white toilet'. Find frequency of the letter 'r'
answer:
2


question:
Sentence: 'a group of people stand inside of a big room'. Find frequency of the letter 'o'
answer:
6


question:
Sentence: 'group of boys in suits gathered with an audience'. Find frequency of the letter 'o'
answer:

3