#include <iostream>
using namespace std;
bool huiwen(string str){
int strLen=str.length();
bool ispalindrome=true;
if(strLen<=1)
return true;
for(int i=0;i<strLen/2;i++)
{
if(str[i]!=str[strLen-1-i]){
ispalindrome=false;
break;
}
}
return ispalindrome;
}
int main() {
char str[]="aaaabaaaa";
int flag=huiwen(str);
if(flag)
cout<<str<<"is a palindrome."<<endl;
else
cout<<str<<"is not a palindrome."<<endl;
return 0;
}