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

Q: Sentence: 'a woman with short, brown hair is looking into a circular mirror and holding a camera up to her cheek'. Find frequency of the letter 'e'

A: 4
****
Q: Sentence: 'pedestrians pass by a stop sign, some holding surfboards'. Find frequency of the letter 'n'

A: 3
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Q: Sentence: 'man in black suit and woman in black outfit with leather purse'. Find frequency of the letter 'a'

A:
6
****