In this task, you need to count the number of words in a sentence that contain the given letter

Example Input: Sentence: 'ther e is a commuter train that is coming on the tracks'. How many words contain the letter 'r' in the sentence.
Example Output: 4

Example Input: Sentence: 'a person in uniform is on a motorcycle near other uniformed people'. How many words contain the letter 'r' in the sentence.
Example Output: 6

Example Input: Sentence: 'a man in white shirt with soccer ball on a field'. How many words contain the letter 't' in the sentence.
Example Output:
3

