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.

Input: Consider Input: Sentence: 'a red passenger train traveling passed a large tourist building'. How many words start with the letter 't' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a man riding on top of a wave on a surfboard'. How many words start with the letter 'o' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a bird sitting on a branch of a tree'. How many words start with the letter 'a' in the sentence.


Output: 3