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

Sentence: 'the small black and white dog holds onto a frisbee'. Find frequency of the letter 'h'
3

Sentence: 'a group of giraffes walk together by a hill'. Find frequency of the letter 'b'
1

Sentence: 'individual servings of jello for children in parfait glasses are being topped with whipped creme and nonpareils'. Find frequency of the letter 'l'

6