键盘输入输出

import java.io.*;
public class Main{
	public static void main(String[] args){
		InputStreamReader isr = new InputStreamReader(System.in);
		BufferedReader br = new BufferedReader(isr);
		String s = null;
		try{
			s = br.readLine();
			while(s != null){
				if(s.equalsIgnoreCase("exit")) break;
				System.out.println(s.toUpperCase());
				s = br.readLine();
			}
			br.close();
		}catch(IOException e){
			e.printStackTrace();
		}
	}
}