/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.Pattern;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	private static final Pattern ALL_NON_NUMERICS_EXCEPT_LEADING_MINUS_AND_E_AND_LAST_DOT_OR_COMMA = Pattern.compile("[^\\d,.\\-+eE]|(?<!(^|[eE]))\\s*[+\\-]|[eE](?!\\s*[+\\-]?\\s*\\d+$)|[.,](?=.*[.,])");
 
	public static void main (String[] args) throws java.lang.Exception
	{
		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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