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

[Q]: Sentence: 'a stop sign next to houses with christmas lights'. Find frequency of the letter 's'
[A]: 7


[Q]: Sentence: 'a batter, catcher and umpire waiting for the pitch and a major league baseball game'. Find frequency of the letter 'c'
[A]: 3


[Q]: Sentence: 'a man with small children on the beach getting ready to fly kites'. Find frequency of the letter 'n'
[A]:
4