In this task, you need to count the number of words in a sentence that start with the given letter. Answer with numbers and not words.

Ex Input:
Sentence: 'a man that is playing a wii in a living room'. How many words start with the letter 'i' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'two elephants with people riding on them next to block barriers'. How many words start with the letter 'o' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'woman smiling holding a baseball bat on her shoulders'. How many words start with the letter 'b' in the sentence.

Ex Output:

2