import java.util.*;
 
public class PalindromeV1
{
  public static void main(String[] args)
  {
   Scanner sc = new Scanner(System.in);
   System.out.println("输入一个字符串: ");
   String word = sc.next();
   int i = word.length();
   int j = 0;
   while (j <= (i / 2) -1 && word.charAt(j) == word.charAt(i - j - 1))
     j++;
   if (j == i / 2)
    System.out.println("输入字符串是回文.");
   else
    System.out.println("输入字符串不是回文.");
   }
}
//java/7225