instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a construction sign is displayed on a street'. Find frequency of the letter 'i'
answer:
4


question:
Sentence: 'a white and blue plate topped with meat and a salad'. Find frequency of the letter 'u'
answer:
1


question:
Sentence: 'a room filled with tables of unripe bananas'. Find frequency of the letter 'o'
answer:

3