7-3 字符串替换 (10分)（Java，超长字符串替换创建快速输入流）

// package test;// 3
//这输入输出就离谱
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.*;

public class Main{
    public static String exchange(String init, String target, String result){
        return init.replaceAll(target,result);
    }
    public static void main(String[] args) throws IOException {
        BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
        StringBuilder sb = new StringBuilder();
        String temp;
        while(!(temp = bf.readLine()).equals("end")){
            sb.append(temp);
            sb.append("\n");
        }
        String init = new String(sb);
        String target = bf.readLine();
        String result = bf.readLine();
        System.out.print(exchange(init,target,result));
    }
}

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