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

[Q]: Sentence: 'a plastic plastic plate topped with three different type of food'. Find frequency of the letter 'l'
[A]: 3


[Q]: Sentence: 'the two dogs are playing in the pen together'. Find frequency of the letter 'o'
[A]: 3


[Q]: Sentence: 'a person on skis standing on some snow'. Find frequency of the letter 's'
[A]:
6