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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. public class Main
  6. {
  7. 	public static void main (String[] args) throws java.lang.Exception
  8. 	{
  9. 		Scanner in = new Scanner(System.in);
  10. 		int n = in.nextInt();
  11. 		String s = in.next();
  12. 		char res = 0;
  13. 		for(int i = 0; i < n; i++)
  14. 			res ^= s.charAt(i);
  15. 		if (res == 0)
  16. 			System.out.println("Ok");
  17. 		else 
  18. 			System.out.printf("%c\n",res);
  19. 	}
  20. }
Success #stdin #stdout 0.07s 2184192KB
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https://ideone.com/YAyxoD
2807
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
secret

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