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

[Q]: Sentence: 'a man pushing a cart full of bananas'. Find frequency of the letter 'u'
[A]: 2


[Q]: Sentence: 'a bird on a tree is flapping its wings'. Find frequency of the letter 'o'
[A]: 1


[Q]: Sentence: 'an old glass vase containing flowers on a glass table'. Find frequency of the letter 'b'
[A]:
1