package de.codegym.task.task18.task1818;
import java.io.*;
/*
Zwei in einem
*/
public class Solution {
public static void main(String[] args) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
FileOutputStream out1 = new FileOutputStream(reader.readLine());
FileInputStream in1 = new FileInputStream(reader.readLine());
FileInputStream in2 = new FileInputStream(reader.readLine());
byte[] buffer1 = new byte[in1.available()];
byte[] buffer2 = new byte[in2.available()];
int data1 = in1.read(buffer1);
out1.write(buffer1, 0, data1);
int data2 = in2.read(buffer2);
out1.write(buffer2, 0, data2);
reader.close();
out1.close();
in1.close();
in2.close();
}
}