UVA Problem ID 10082 ( WERTYU )

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main
{

    public static void main(String[] args) throws IOException 
    {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String keyboard="`1234567890-=QWERTYUIOP[]\\ASDFGHJKL;'ZXCVBNM,./";
        String input;
        StringBuffer sb=new StringBuffer("");
        while((input=br.readLine())!=null)
        {
         for (int i = 0; i < input.length(); i++) {
    int index=keyboard.indexOf(input.charAt(i));
    if(index==-1)
    {
     sb.append(input.charAt(i));
    }
    else
     sb.append(keyboard.charAt(index-1));
   }
         sb.append("\n");
        } 
        System.out.print(sb);
    }
}