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String dataString is read from input. Append each unique character found in dataString to uniqueCharacters in the order that the character first appears.

Ex: If the input is Pennsylvania, then the output is:

Unique characters found: $P,e,n,s,y,l,v,a,$ i

Note: dataString.indexOf$($dataString$.$charAt$($i$))==$ i returns true if dataString.charAt$($i$)$ occurs the first time at index $i$ of dataString.

import java.util.Scanner;

public class ExtractUniqueCharacters $\{$

public static void main$($String$[]$ args$)\{$

Scanner scnr $=$ new Scanner$($

System.in$)$;

String datastring;

int i;

String uniqueCharacters $="$;

dataString $=$ scnr$.$ nextLine $()$;

I$*$ Your code goes here $*/$

System.out.print$("$Unique characters found: $")$;

for $(i=0$; $i$ uniqueCharacters.length $()$;$++i)\{$

System.out.print $($uniqueCharacters$.$charAt$($i$))$;

if $($i $!=$ uniqueCharacters.length$()-1)\{$

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