#include <iostream>
using namespace std;
 
const int MAX_SIZE = 50;
const int MAX_VAL = 10000;
int freq[MAX_VAL];
 
int main() {
	int n, mt[MAX_SIZE + 1][MAX_SIZE + 1];
	cin >> n;
	int highVal = 1;
	for (int i = 1; i <= n; ++i) {
		for (int j = 1; j <= n; ++j) {
			cin >> mt[i][j];
			++freq[mt[i][j]];
			if (mt[i][j] >= highVal) {
				highVal = mt[i][j]; // 4
			}
		}
	}
	int flag = 1;
	for (int i = 1; i <= highVal || i <= n; ++i) {
		if (freq[i] < 1 && i <= n) {
			flag = 0;
		}
		//cout << freq[i] <<" " << i <<"\n";
	}
 
	int highApar = 0, saveVal = highVal;
 
	for (int i = n + 1; i <= highVal; ++i) {
		if (freq[i] >= highApar ) { // && saveVal > n
			highApar = freq[i];
			saveVal = i;
		}
 
	}
	if (highVal <= n) {
		saveVal = 0;
	}
 
	if (flag == 1) {
		cout << "DA!\n" ;
		if (saveVal != 0) {
			cout << saveVal;
		} else {
			cout << "NU!";
		}
	}  else  {
		cout << "NU!\n";
		if (saveVal != 0) {
			cout << saveVal;
		} else {
			cout << "NU!";
		}
	}
 
 
 
//	cout << flag << " "<< saveVal;;
	return 0;
}

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NQoxIDIgNCAzIDQKMSAyIDQgNCA0CjEgMiA0IDMgNAoxIDIgNCAzIDQKMSAyIDQgMyA0Cgo0CjEgMiAzIDQKMSAyIDMgNCAKMSAyIDMgNCAKMSAyIDMgNCAKCgo0CjEgMiA2IDQKNTUgNTUgNjMgMTIKNjMgNTUgNTUgMQo0IDMgMiAxCgo0CjEgMiAzIDUKMSAyIDMgNCAKMSAyIDMgNCAKMSAyIDMgNCAKCjQKMSAyIDMgNAo1NSA2MyA2MyAxMgo2MyA1NSA1NSAxCjQgMyAyIDEKCjQKMSAyIDMgNSAKMSAyIDMgNCAKMSAyIDMgNCAKMSAyIDMgNCAKCjQKMSAyIDMgNAo1NSA2MyA2MyAxMgo2MyA1NSA1NSAxCjQgMyAyIDEKCgo0CjEgMiAzIDUgCjEgMiAzIDQgCjEgMiAzIDQgCjEgMiAzIDQg

5
1 2 4 3 4
1 2 4 4 4
1 2 4 3 4
1 2 4 3 4
1 2 4 3 4

4
1 2 3 4
1 2 3 4 
1 2 3 4 
1 2 3 4 


4
1 2 6 4
55 55 63 12
63 55 55 1
4 3 2 1

4
1 2 3 5
1 2 3 4 
1 2 3 4 
1 2 3 4 

4
1 2 3 4
55 63 63 12
63 55 55 1
4 3 2 1

4
1 2 3 5 
1 2 3 4 
1 2 3 4 
1 2 3 4 

4
1 2 3 4
55 63 63 12
63 55 55 1
4 3 2 1


4
1 2 3 5 
1 2 3 4 
1 2 3 4 
1 2 3 4