/* 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 s =
    "abdc"
    .codePoints()
    .map( codePoint -> codePoint + 1 )
    .collect( 
        StringBuilder::new , 
        StringBuilder::appendCodePoint , 
        StringBuilder::append 
    )
    .toString() ;
 
 
System.out.println( s ) ;
	}
}

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