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 passenger train that is passing under some blue bars'. How many words start with the letter 'u' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a person on skis goes across a snowy slope'. How many words start with the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'children standing on the curb of a street under s sign'. How many words start with the letter 't' in the sentence.


Output: 1