First Repeating Character From Last - Java

A string S is passed as the input. S has at least one repeating character. The program must print the first repeating character C from the last.

Input Format:
The first line contains S.

Output Format:
The first line contains C.

Boundary Conditions:
Length of S will be from 3 to 100.

Example Input/Output 1:
Input:
abcdexyzbwqpooplj

Output:
p

Source Code:

import java.util.*;

public class Hello {

public static void main(String[] args) {

Scanner sc=new Scanner(System.in);

String s=sc.nextLine();

String s1=new StringBuffer(s).reverse().toString();

char[] c=s1.toCharArray();

HashMap<Character,Integer> h=new HashMap<Character,Integer>();

for(char x:c)

{

    if(h.containsKey(x))

    h.put(x,h.get(x)+1);

    else

    h.put(x,1);

}

for(char x:c)

{

    if(h.get(x)>1)

    {

        System.out.println(x);

        break;

    }

}

}

}