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 dog laying on the back of a boat in the water'. Find frequency of the letter 't'
answer:
4

question:
Sentence: 'a picture of two computers on a table'. Find frequency of the letter 'r'
answer:
2