In this task, you need to count the number of times the given letter appears in the given sentence.

[Q]: Sentence: 'two pepperoni pizzas and a cup on a counter'. Find frequency of the letter 'u'
[A]: 2


[Q]: Sentence: 'hand holding a white calculator inside a store'. Find frequency of the letter 'o'
[A]: 3


[Q]: Sentence: 'a young man holding a baseball bat on top of a field'. Find frequency of the letter 'o'
[A]:
5