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

[Q]: Sentence: 'a surfer wipes out on a huge wave'. Find frequency of the letter 'a'
[A]: 3


[Q]: Sentence: 'young girl playing with refrigerator magnet while kneeling on floor'. Find frequency of the letter 'n'
[A]: 6


[Q]: Sentence: 'a red sign says caution children at play'. Find frequency of the letter 'a'
[A]:
5