You are given a sentence containing words separated by single spaces and a searchWord. Your task is to determine whether searchWord is a prefix of any word in the sentence.

Return the 1-based index of the first word in which searchWord appears as a prefix.

• If searchWord is a prefix of multiple words, return the index of the earliest such word.

• If no word starts with searchWord, return $-1$.

A prefix of a string is any contiguous substring that begins at the first character.

Constraints:

• $1 <=$ sentence.length $<= 100$

• $1 <=$ searchWord.length $<= 10$

• The sentence consists of lowercase English letters and spaces.

• searchWord consists of lowercase English letters.