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

[Q]: Sentence: 'flower in a vase full of water sitting on a stand '. Find frequency of the letter 'l'
[A]: 3


[Q]: Sentence: 'there is a person standing on a blue towel'. Find frequency of the letter 'n'
[A]: 4


[Q]: Sentence: 'three young people goofing around; one of the guys has a football, the girl has a teddy bear'. Find frequency of the letter 'd'
[A]:
3