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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. import java.io.IOException;
  8.  
  9. /**
  10.  * Created by kaaveh on 1/22/15.
  11.  */
  12. class _505A_ {
  13.     public static void main(String[] args) {   //I hope enjoy! :)
  14.  
  15.         kaaveh in = new kaaveh();
  16.         String data = in.kLine(10);
  17.  
  18.         int size = data.length() / 2;
  19.         int lng= data.length();
  20.         String res = "";
  21.         boolean palin = true;
  22.  
  23.         for (int i=0; i<size; i++){
  24.             if (data.charAt(i) != data.charAt(lng-1-i)){
  25.                 res += data.substring(0,lng-i);
  26.                 res += data.charAt(i);
  27.                 res += data.substring(lng - i, lng);
  28.                 break;
  29.             }
  30.         }
  31.  
  32.         if (res.equals("")){
  33.             if (lng % 2 == 0){
  34.                 System.out.println(data.substring(0, size) + "a" + data.substring(size, lng));
  35.             }else {
  36.                 System.out.println(data.substring(0, size) + data.charAt(size) + data.substring(size, lng));
  37.             }
  38.             System.exit(0);
  39.         }
  40.  
  41.         for (int i=0; i<size; i++){
  42.             if (res.charAt(i) != res.charAt(lng-i)){
  43.                 palin = false;
  44.             }
  45.         }
  46.         if (palin)
  47.             System.out.println(res);
  48.         else
  49.             System.out.println("NA");
  50.     }
  51. }
  52.  
  53. class kaaveh{
  54.     static String kLine (int maxLg)
  55.     {
  56.         byte lin[] = new byte [maxLg];
  57.         int lg = 0, car = -1;
  58.         String line = "";
  59.  
  60.         try
  61.         {
  62.             while (lg < maxLg)
  63.             {
  64.                 car = System.in.read();
  65.                 if ((car < 0) || (car == '\n')) break;
  66.                 lin [lg++] += car;
  67.             }
  68.         }
  69.         catch (IOException e)
  70.         {
  71.             return (null);
  72.         }
  73.  
  74.         if ((car < 0) && (lg == 0)) return (null);  // eof
  75.         return (new String (lin, 0, lg));
  76.     }
  77.  
  78.     static String knex (int maxLg)
  79.     {
  80.         byte lin[] = new byte [maxLg];
  81.         int lg = 0, car = -1;
  82.         String line = "";
  83.  
  84.         try
  85.         {
  86.  
  87.             while ((car < 0) || (car == '\n') || (car == ' ') || (car == '\t') || (car == '\r'))
  88.                 car = System.in.read();
  89.  
  90.             while (lg < maxLg)
  91.             {
  92.                 if ((car < 0) || (car == '\n') || (car == ' ') || (car == '\t') || (car == '\r')) break;
  93.                 lin [lg++] += car;
  94.                 car = System.in.read();
  95.             }
  96.         }
  97.         catch (IOException e)
  98.         {
  99.             return (null);
  100.         }
  101.  
  102.         if ((car < 0) && (lg == 0)) return (null);  // eof
  103.         return (new String (lin, 0, lg));
  104.     }
  105.  
  106.     static int kint()
  107.     {
  108.         return Integer.parseInt(knex(11));
  109.     }
  110.  
  111.     static long kLong()
  112.     {
  113.         return Long.parseLong(knex(20));
  114.     }
  115.  
  116.     static double kdouble()
  117.     {
  118.         return Double.parseDouble(knex(100));
  119.     }
  120. }
Success #stdin #stdout 0.1s 320320KB
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https://ideone.com/uo7RnP
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
public

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