import java.util.LinkedList;
import java.util.List;
import java.util.Scanner;

/**
 * ACSL Contest 1 Intermediate division
 * 
 * @author Jing Wang<br>
 *         River Hill High School (School code: ####)<br>
 */
public class Contest1 implements Executable {
	public static void main(String[] args) {
		Executer.execute(new Contest1());
	}

	public void execute(String input) {
		String[] parts = input.split(",\\s*");
		double[] p1 = new double[3], p2 = new double[3];
		for (int i = 0; i < 3; i++) {
			p1[i] = Double.parseDouble(parts[i]);
		}
		for (int i = 0; i < 3; i++) {
			p2[i] = Double.parseDouble(parts[i + 3]);
		}
		for (int offset = 0; offset < 3; offset++) {
			boolean equal = true;
			for (int i = 0; i < 3; i++) {
				if (p1[i] != p2[(i + offset) % 3]) {
					equal = false;
					break;
				}
			}
			if (equal) {
				String triangle = "DEF";
				System.out.println(triangle.substring(offset)
				        + triangle.substring(0, offset));
				return;
			}

			equal = true;
			for (int i = 0; i < 3; i++) {
				if (p1[i] != p2[2 - (i + offset) % 3]) {
					equal = false;
					break;
				}
			}
			if (equal) {
				String triangle = "DFE";
				System.out.println(triangle.substring(offset)
				        + triangle.substring(0, offset));
				return;
			}
		}
		System.out.println("NONE");
	}
}

interface Executable {
	void execute(String input) throws Throwable;
}

class Executer {
	public static void execute(Executable e) {
		Scanner scan = new Scanner(System.in);
		System.out.println("Leave a blank line to terminate input.");
		List<String> inputs = new LinkedList<String>();
		String current;
		while (!(current = scan.nextLine()).equals("")) {
			inputs.add(current);
		}
		for (String input : inputs) {
			try {
				e.execute(input);
			} catch (Throwable t) {
				System.out.println("Error");
			}
		}
	}