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

[Q]: Sentence: 'a woman walking on a shore next to a river'. Find frequency of the letter 'v'
[A]: 1


[Q]: Sentence: 'a bunch of fruit sitting in a bowl, its overflowing'. Find frequency of the letter 't'
[A]: 4


[Q]: Sentence: 'several people with surfboards are in the ocean'. Find frequency of the letter 'h'
[A]:
2