import acm.program.ConsoleProgram;

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.util.Scanner;



public class Task1 extends ConsoleProgram {
    public void run() {
        String allFile = fileReader();
        CharSequence toReplace = readLine();
        CharSequence newLine = readLine();

        println(doTask(allFile,toReplace,newLine));
    }

    public String fileReader() {
        FileReader fr = null;
        try {
            fr = new FileReader("C:\\Users\\БарабухаМаріяМаксимі\\Desktop\\workspace\\pract11\\src\\pract11\\in.txt");
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        Scanner scan = new Scanner(fr);
        String str = "";
        boolean f = true;
        while (scan.hasNextLine()) {
            if (f) {
                f = false;
                str = scan.nextLine();
            } else
                str = str + "\n" + scan.nextLine();
        }

        return str;
    }


    public String doTask(String allFile, CharSequence toReplace, CharSequence newLine) {
        return allFile.replace(toReplace,newLine);
    }
}