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

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

A: 5
****
Q: Sentence: 'two indian women in colorful garb standing barefoot with two indian men'. Find frequency of the letter 'd'

A: 3
****
Q: Sentence: 'a truck moving along a highway which has a guardrail'. Find frequency of the letter 'a'

A:
8
****