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: 'there is a group of people with horses and a wagon'. How many words start with the letter 'a' in the sentence.

Output: 3

Input: Consider Input: Sentence: 'a room filled with a stove and surrounded by cabinets'. How many words start with the letter 'w' in the sentence.

Output: 1

Input: Consider Input: Sentence: 'some cars in the road and a street light with a red light'. How many words start with the letter 't' in the sentence.
Output: 1