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

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

A: 3
****
Q: Sentence: 'a notebook and pen are left on a park bench'. Find frequency of the letter 'e'

A: 5
****
Q: Sentence: 'a red train is easily recognizable in between the mountains'. Find frequency of the letter 'l'

A:
2
****