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Can't say what is wrong without seeing the code and knowing what the code is supposed to be doing.

What are the steps you'd take doing it manually? You should design the steps to be taken before writing the code.
If you have the steps the program should take, which step are you having problems...

But you have only seen 1 of 4 characters. Looking at The next three could change the results.

Remember there are 4 characters written on the paper. The question was: Is it a number or not?

You were looking at one of 4 characters. You need to see all four before you can say for sure.
What would you do after each of the two possible results of looking at the first character?

What would you do in each case? If the character was a numeric digit or if it was a non-numeric?

Not simple minded enough. What if you can only see ONE character at a time?

Or say some one gives you the characters one at a time.

Not simple minded enough. How would you determine if what was written was a number?
Say there are 4 characters on the paper: 1234 or 1e33 or a444 or zesd

Forget about the program until you have the list of steps it would take to solve the problem. If some wrote something on a piece of paper and gave it to you, How would you decide if what was written...

Please post the full text of any error messages you get.

Make a list of the steps you would take if you were to do it manually. Be real simple minded about the steps you'd take, computers have no...