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

[Q]: Sentence: 'there are two men sitting on a couch playing video games'. Find frequency of the letter 'v'
[A]: 1


[Q]: Sentence: 'surfboard being displayed in stor window with clothes behind it'. Find frequency of the letter 't'
[A]: 4


[Q]: Sentence: 'a cow standing on concrete in front of a car'. Find frequency of the letter 'a'
[A]:
4