import java.util.Scanner;
class Codeaft
{
    public static void main(String args[])
    {
        String s1,s2="";
        System.out.println("———————————————————————————————————————————");
        System.out.println("Program to find unique characters");
        System.out.println("———————————————————————————————————————————");
        Scanner sc=new Scanner(System.in);
        System.out.print("Enter the string ");
        s1=sc.nextLine();
        for(int i=0;i<s1.length();i++)
        {
            if(s2.indexOf(s1.charAt(i))==-1)
            {
                s2=s2+s1.charAt(i);
            }
        }
        System.out.println("\nUnique characters "+s2);
        System.out.println("———————————————————————————————————————————");
    }
}

codeaft@codeaft:~$ javac Codeaft.java
codeaft@codeaft:~$ java Codeaft
———————————————————————————————————————————
Program to find unique characters
———————————————————————————————————————————
Enter the string CODEAFT

Unique characters KODINGW
———————————————————————————————————————————
codeaft@codeaft:~$ 

import java.util.Scanner;
class Codeaft
{
    public static void main(String args[])
    {
        String s;
        System.out.println("———————————————————————————————————————————");
        System.out.println("Program to find unique characters");
        System.out.println("———————————————————————————————————————————");
        Scanner sc=new Scanner(System.in);
        System.out.print("Enter the string ");
        s=sc.nextLine();
        s=s.toUpperCase();
        for(char letter='A';letter<='Z';letter++)
        {
            for(int i=0;i<s.length();i++)
            {
                if(letter==s.charAt(i))
                {
                    System.out.print("\nUnique character "+letter);
                    break;
                }
            }
        }
        System.out.println("\n———————————————————————————————————————————");
    }
}

codeaft@codeaft:~$ javac Codeaft.java
codeaft@codeaft:~$ java Codeaft
———————————————————————————————————————————
Program to find unique characters
———————————————————————————————————————————
Enter the string CODEAFT

Unique character D
Unique character G
Unique character I
Unique character K
Unique character N
Unique character O
Unique character W
———————————————————————————————————————————
codeaft@codeaft:~$