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

Sentence: 'a man on stiltz is standing under a pink umbrella'. Find frequency of the letter 's'
3

Sentence: 'some cubbies with towels in a blue bathroom'. Find frequency of the letter 'l'
2

Sentence: 'a woman feeds a giraffe with her mouth'. Find frequency of the letter 'a'

4