instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'two pepperoni pizzas and a cup on a counter'. Find frequency of the letter 'u'
answer:
2


question:
Sentence: 'a man on stiltz is standing under a pink umbrella'. Find frequency of the letter 's'
answer:
3


question:
Sentence: 'a cup of coffee and a banana are setting on this desk'. Find frequency of the letter 't'
answer:

3