instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a bathroom with a sink, counter top, and mirror is shown'. Find frequency of the letter 'i'
answer:
4

question:
Sentence: 'a room with a big screen television and a couch'. Find frequency of the letter 'h'
answer:
2

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