/* 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 changeStr(String str){
        str="welcome";
    }
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		String str="1234";
        changeStr(str);
        System.out.println(str);
	}
}

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