/* 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
	{
		System.out.println(plusOut("1234xy5678", "xy"));
	}
	public static String plusOut(String str, String word) {
        String bob = str.replaceAll("[^" + word + "]", "+");
        return bob;
    }
}