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

[Q]: Sentence: 'a person does a trick on a ramp on a snowboard'. Find frequency of the letter 's'
[A]: 3


[Q]: Sentence: 'a gourmet looking hamburger with fries on a dining table with some wine'. Find frequency of the letter 't'
[A]: 4


[Q]: Sentence: 'a table topped with a cupcake on a picture of a cupcake'. Find frequency of the letter 'o'
[A]:
3