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

[Q]: Sentence: 'a group of people are playing soccer on a beach'. Find frequency of the letter 'l'
[A]: 2


[Q]: Sentence: 'a bus is stopped in front of a graphic statue'. Find frequency of the letter 'e'
[A]: 2


[Q]: Sentence: 'a number of people flying kites on a beach near a body of water'. Find frequency of the letter 'n'
[A]:
4