#include "stdafx.h"
#include <iostream>
#include <string.h>

using namespace std;

int main()
{
	char text[100];
	char cuvinte[100][100];
	int k = 0;
	bool flag = 0;
	cin.get(text, 99);
	cin.get();
	char* p;
	p = strtok(text, " ");
	while (p != NULL)
	{
		strcpy(cuvinte[k], p);
		k++;
		p = strtok(NULL, " ");
	}
	for (int i = 0; i < k; i++)
	{
		if (strlen(cuvinte[i]) % 2 == 1)
		{
			char cuvantTest[100];
			strcpy(cuvantTest, cuvinte[i]);
			int mijloc = strlen(cuvantTest) / 2;
			strcpy(cuvantTest + mijloc + 1, cuvantTest + mijloc);
			cout << cuvantTest << endl; ///aici arata creeee
			for (int j = 0; j < k; j++)
			{
				if (strcmp(cuvinte[j], cuvantTest) == 0)
				{
					flag = 1;
					break;
				}
			}
		}
	}
	if (flag == 0)
	{
		cout << "NU";
	}
	else
	{
		cout << "DA";
	}
}