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: 'four women around a man sitting in front of a cake'. Find frequency of the letter 'o'
[A]: 5


[Q]: Sentence: 'a variety of men and women in an asian airport'. Find frequency of the letter 'o'
[A]:
3