import java.io.*;
/**
 * @author quhz
 *@deprecated java中输入a-z和A-Z后通过if来完成转换代码
 */
public class Math{
public static void main(String args[])
{
InputStreamReader zimu=new InputStreamReader(System.in);
BufferedReader zimu1=new BufferedReader(zimu);
try
{
System.out.print("请输入字母:");
String str2=zimu1.readLine();
   char str=str2.charAt(0);
   int a=(int)str;
if(a>=97&&a<=122)
{
int b=(int)(a-32);
char c=(char)b;
System.out.println("对应字母为:"+c);
}else if(a<=90&&a>=65)
{
int b=(int)(a+32);
char c=(char)b;
System.out.println("对应字母为:"+c);
}else
{
System.out.println("请输入正确字母");
}

}catch(Exception e)
{
System.out.print("发生I/O错误");
System.err.println("发生I/O错误");
       e.printStackTrace();
}
}
}