TASK DEFINITION: In this task, you need to count the number of words in a sentence that contain the given letter
PROBLEM: Sentence: 'a man and a woman stand under an umbrella'. How many words contain the letter 's' in the sentence.

SOLUTION: 1

PROBLEM: Sentence: 'young girls with backpacks are standing near stairs that look to go to the subway'. How many words contain the letter 'r' in the sentence.

SOLUTION: 4

PROBLEM: Sentence: 'there is a baby with a pacifier in his mouth and a tie on'. How many words contain the letter 'i' in the sentence.

SOLUTION:
6