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

Sentence: 'there are some warning signs on a public toilet'. How many words contain the letter 'a' in the sentence.
3

Sentence: 'a zebra is standing in the shallow water'. How many words contain the letter 't' in the sentence.
3

Sentence: 'a picture of a cat that is with a human'. How many words contain the letter 'c' in the sentence.

2