//Brian Bland
//West Chester Henderson HS
//Senior 3 - Contest 1
import java.util.Scanner;
public class TrianglesMain {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		Scanner input=new Scanner(System.in);
		double AB,BC,AC,DE,EF,DF;
		for(int i=1;i<6;i++)
		{
			System.out.print(i+". ");
			AB=input.nextDouble();
			BC=input.nextDouble();
			AC=input.nextDouble();
			DE=input.nextDouble();
			EF=input.nextDouble();
			DF=input.nextDouble();
			if(((AB+BC)<=AC)||((AB+AC)<=BC)||((BC+AC)<=AB))
				System.out.println("NOT VALID");
			else if(((DE+EF)<DF)||((DE+DF)<EF)||((EF+DF)<DE))
				System.out.println("NOT VALID");
			else if(((AB/BC)==(DE/EF))&&((AB/AC)==(DE/DF)))
				System.out.println("DEF");
			else if(((AB/BC)==(DF/EF))&&((AB/AC)==(DF/DE)))
				System.out.println("DFE");
			else if(((AB/BC)==(DE/DF))&&((AB/AC)==(DE/EF)))
				System.out.println("EDF");
			else if(((AB/BC)==(EF/DF))&&((AB/AC)==(EF/DE)))
				System.out.println("EFD");
			else if(((AB/BC)==(EF/DE))&&((AB/AC)==(EF/DF)))
				System.out.println("FED");
			else if(((AB/BC)==(DF/DE))&&((AB/AC)==(DF/EF)))
				System.out.println("FDE");		
			else
				System.out.println("NONE");
		}
	}

}