TASK DEFINITION: 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.
PROBLEM: Sentence: 'a crowd of people on the street one of which is taking pictures with a cell phone'. How many words start with the letter 'o' in the sentence.

SOLUTION: 4

PROBLEM: Sentence: 'a couple of kids are sitting in the grass'. How many words start with the letter 'a' in the sentence.

SOLUTION: 2

PROBLEM: Sentence: 'a little girl sitting at a table eating food from a plate'. How many words start with the letter 'a' in the sentence.

SOLUTION:
4