TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a man in a sweatshirt is taking his own picture'. Find frequency of the letter 'u'

SOLUTION: 1

PROBLEM: 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'

SOLUTION: 4

PROBLEM: Sentence: 'store window display featuring tennis balls and mannequins wearing lingerie'. Find frequency of the letter 'o'

SOLUTION:
2