TASK DEFINITION: In this task, you need to count the number of words in a sentence that contain the given letter
PROBLEM: Sentence: 'a little boy learning to throw a frisbee'. How many words contain the letter 'h' in the sentence.

SOLUTION: 1

PROBLEM: Sentence: 'ther e is a commuter train that is coming on the tracks'. How many words contain the letter 'r' in the sentence.

SOLUTION: 4

PROBLEM: Sentence: 'a happy black dog running in the snow'. How many words contain the letter 'a' in the sentence.

SOLUTION:
3