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import java.util.Scanner;
public class duplicateCharactersInWord
{
     public static void main(String[] args)
     {
        int i=0,j=0,count=0;
        String wd="";
        Scanner sc = new Scanner(System.in);

        System.out.println("Enter a word");

        wd =sc.next();

        /*Converts given word into character array*/
        char characters[] = wd.toCharArray();

        System.out.println("Duplicate characters in "+wd+":");
        for(i = 0; i < characters.length; i++)
        {
            count = 0;
            for(j = i+1; j < characters.length; j++)
            {
                if(characters[i] == characters[j])
                {
                    count++;
                    /*Set characters[j] to ~ to avoid printing visited character*/
                    characters[j] = '~';
                }
            }
            /*A character is considered as duplicate if count is greater than 1  */
            if(count > 0 && characters[i] != '~')
            {
                System.out.println(characters[i]);
            }
        }
    }
}