import java.util.*;
import java.util.regex.*;
import java.lang.*;
import java.io.*;
 
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String pattern = "[^\\d,.+eE-]|(?<!(?:^|[eE])\\s*)[+-]|[eE](?!\\s*(?:[+-]\\s*)?\\d+$)|[.,](?=.*[.,])";
		Pattern ALL_NON_NUMERICS_EXCEPT_LEADING_MINUS_AND_E_AND_LAST_DOT_OR_COMMA = Pattern.compile(pattern);
		var intermediate = ALL_NON_NUMERICS_EXCEPT_LEADING_MINUS_AND_E_AND_LAST_DOT_OR_COMMA
		    .matcher("3 e   -9")
		    .replaceAll("");
		System.out.println(intermediate);
	}
}

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