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 without a shirt riding a skateboard'. How many words start with the letter 'r' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'there are people in chairs watching a projection screen'. How many words start with the letter 't' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'people on a beach flying kites and sitting under umbrellas'. How many words start with the letter 'u' in the sentence.

Ex Output:

2