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

[Q]: Sentence: 'oranges are sitting in a bowl on a table'. Find frequency of the letter 'a'
[A]: 5


[Q]: Sentence: 'an orange cat sitting on the ground next to a  purse'. Find frequency of the letter 's'
[A]: 2


[Q]: Sentence: 'man on pink surf board surfing on the waves'. Find frequency of the letter 'p'
[A]:
1