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

Input: Consider Input: Sentence: 'the zebra is showing his rear end to the camera'. How many words contain the letter 'r' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a glass vase with clear glass marbles in it and purple flowers coming out of the vase'. How many words contain the letter 'd' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'several early boat designs are on display'. How many words contain the letter 'p' in the sentence.


Output: 1