/* 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
{
	private static String input="a5b6c7d8";
 
	public static void main (String[] args) throws java.lang.Exception
	{
		System.out.println("String before change = " + input);
 
		for(int i=1; i<input.length()/2+1;i++) {
			input = input.substring(0,i) + input.substring(i+1, input.length()) + input.charAt(i);
		}
		System.out.println("String after Input = " + input);
	}
}

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