import java.io.*;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        String choice;
        choice=enterChoice();
        if (choice.equals("Key"))
            inputConsole();
        else 
            fileReader();
            System.out.println("temp");
    }
    static Scanner sc = new Scanner(System.in);
    static String enterChoice() {
        String choice;
        boolean isCorrect;
        System.out.println("Is the text entered from the keyboard or from a file?(Key or File)");
        do {
            choice = sc.nextLine();
            if (choice.equals("Key") || choice.equals("File"))
                isCorrect = false;
            else {
                System.out.println("Input error. Enter 'Key' or 'File'.");
                isCorrect = true;
            }
        }
        while (isCorrect);
        return choice;
    }

    public static void writeResultFile(String buf){
        System.out.println(solutionFile(buf));
    }
    public static void fileReader(){
        try(FileReader reader = new FileReader("naw.txt"))
        {
            char[] buf = new char[256];
            int c;
            while((c = reader.read(buf))>0){

                if(c < 256){
                    buf = Arrays.copyOf(buf, c);
                }
                System.out.print(buf);
                
            }

        }
        catch(IOException exo){

            System.out.println(exo.getMessage());
        }

        writeResultFile(buf);

    }

    static HashSet<Character> solutionFile(String seq) {

        HashSet <Character> solSetFile = new HashSet<>();

        for (int i = 0; i < seq.length(); i++){
            if (addHashFile().contains(seq.charAt(i))) {
                solSetFile.add(seq.charAt(i));
            }
        }
        return solSetFile;
    }

    static HashSet<Character> addHashFile(){
        HashSet <Character> requiredChars = new HashSet<>();

        for (char i='0'; i<':';i++){
            requiredChars.add(i);
        }
        requiredChars.add('(');
        requiredChars.add(')');
        requiredChars.add('[');
        requiredChars.add(']');
        requiredChars.add('{');
        requiredChars.add('}');

        return requiredChars;

    }

    static void inputConsole(){
        String example = null;
        Scanner scan = new Scanner(System.in);
        System.out.println("введите текст");
        example = scan.next();
        writeResult(example);
    }

    public static void writeResult(String example){
        System.out.println(solution(example));
    }



    static HashSet<Character> solution(String seq) {

        HashSet <Character> solSet = new HashSet<>();

        for (int i = 0; i < seq.length(); i++){
            if (addHash().contains(seq.charAt(i))) {
                solSet.add(seq.charAt(i));
            }
        }
        return solSet;
    }

    static HashSet<Character> addHash(){
        HashSet <Character> requiredChars = new HashSet<>();

        for (char i='0'; i<':';i++){
            requiredChars.add(i);
        }
        requiredChars.add('(');
        requiredChars.add(')');
        requiredChars.add('[');
        requiredChars.add(']');
        requiredChars.add('{');
        requiredChars.add('}');

        return requiredChars;

    }

}