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: 'a railroad train pulling up to the train platform'. Find frequency of the letter 'o'
[EX A]: 3

[EX Q]: Sentence: 'small toilet in a tiny room next to a plunger and a waste basket'. Find frequency of the letter 'x'
[EX A]:
1