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

[EX Q]: Sentence: 'eight donuts are cooked together in oil in a metal tray'. Find frequency of the letter 'h'
[EX A]: 2

[EX Q]: Sentence: 'two computers and a laptop set up on a desk'. Find frequency of the letter 'r'
[EX A]: 1

[EX Q]: Sentence: 'a group of people play a game of frisbe'. Find frequency of the letter 'r'
[EX A]:
2