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

[Q]: Sentence: 'cooked fish and green broccoli share a single white plate'. Find frequency of the letter 'c'
[A]: 3


[Q]: Sentence: 'man riding a skate board down the little board way'. Find frequency of the letter 'k'
[A]: 1


[Q]: Sentence: 'emaciated animals graze for food near the water banks'. Find frequency of the letter 'o'
[A]:
3