#define _USE_MATH_DEFINES

#include <iostream>		//cin, cout
#include <vector>		//vector
#include <algorithm>	//sort,min,max,count
#include <string>		//string,getline, to_string
#include <cstdlib>		//abs(int)
#include <utility>		//swap, pair
#include <deque>		//deque
#include <climits>		//INT_MAX
#include <bitset>		//bitset
#include <cmath>		//sqrt, ceil. M_PI, pow, sin
#include <ios>			//fixed
#include <iomanip>		//setprecision
#include <sstream>		//stringstream
#include <numeric>		//gcd, assumlate
#include <random>		//randam_device
#include <limits>		//numeric_limits

using namespace std;
constexpr long long int D_MOD = 1000000007;

int main() {

	string S;
	cin >> S;

	if (S.length() % 2 == 1) {
		cout << "NO" << endl;
		return 0;
	}

	string temp1, temp2;
	temp1 = S.substr(0, S.length() / 2);
	temp2 = S.substr(S.length() / 2, S.length() / 2);

	if (temp1 == temp2) {
		cout << "YES" << endl;
	}
	else {
		cout << "NO" << endl;
	}

	return 0;

}