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

[Q]: Sentence: 'a river with a long dragon boat in it and rowers on the boat in sets of two, along with two other people'. Find frequency of the letter 'h'
[A]: 4

[Q]: Sentence: 'a variety of a different type of vegetables'. Find frequency of the letter 't'
[A]: 4

[Q]: Sentence: 'there are couches and chairs in the room'. Find frequency of the letter 'o'
[A]:
3