UVA - 11830 - Contract Revision

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

public class Main {

    public static void main(String[] args) throws IOException {

        InputStreamReader isr = new InputStreamReader(System.in);
        BufferedReader br = new BufferedReader(isr);
        StringBuffer sb = new StringBuffer("");
        while (true) {
            String[] str = br.readLine().split(" ");
            if(str[0].equals("0") &&str[1].equals("0"))
                break;
            char dit = str[0].charAt(0);
            StringBuilder temp=new StringBuilder("0");
           
            for(int i=0;i<str[1].length();i++){
                if(str[1].charAt(i)!=dit)
                    temp.append(str[1].charAt(i));
            }
            sb.append(new BigInteger(temp.toString())).append("\n");

        }
        System.out.print(sb);
    }
}