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Good morning! Here's your coding interview problem for today.

This problem was asked by LinkedIn.

Given a string, return whether it represents a number. Here are the different kinds of numbers:

• "10", a positive integer
• "-10", a negative integer
• "10.1", a positive real number
• "-10.1", a negative real number
• "1e5", a number in scientific notation

And here are examples of non-numbers:

• "a"
• "x 1"
• "a -2"
• "-"