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: 'city two way street with cars lined up on both sides'. Find frequency of the letter 'h'

SOLUTION: 2

PROBLEM: Sentence: 'woman playing tennis getting ready to return a serve'. Find frequency of the letter 's'

SOLUTION:
2