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

[Q]: Sentence: 'tow birds flying by a long necked crane'. Find frequency of the letter 'f'
[A]: 1


[Q]: Sentence: 'a sailboat is floating near the rocky shore of a beach'. Find frequency of the letter 'o'
[A]: 5


[Q]: Sentence: 'a kitchen scene complete with a fridge and an oven'. Find frequency of the letter 't'
[A]:
3