/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String[] data = new String[] {
			"+a56b78", "a56b78", "a56b78+a56b78"
		};
		for (String s : data) {
			String r = s.replaceAll("((?<!^)[^0-9]|^[^0-9+])", "");
			System.out.println(r);
		}
	}
}

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