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import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

import java.util.List;

public class Main {

/*

* 1.java 字节码是java源文件编译产生的中间文件

* java虚拟机是可运行java字节码的假象计算机

* java源程序-》(经过编译)字节码(Byte Code)->机器码

* */

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

// Calendar calendar=Calendar.getInstance();

// String data="2018-10-11";

// SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-dd");

// calendar.setTime(format.parse(data));

// System.out.println(calendar.get(Calendar.WEEK_OF_YEAR));

String remain="123";

System.out.println(

remain.substring(0,0)+remain.substring(1)

);

}

}