#include <stdio.h>
    int main()
    {
        int a=1, b=1, c=1;

        while (scanf("%d %d %d", &a, &b, &c) != EOF)
        {
            if (a + b > c && a + c > b && b + c > a)
            {
                if (a == b && b == c)
                {
                    printf("Equilateral triangle!\n");
                }
                else if (a == b || b == c || a == c)
                {
                    printf("Isosceles triangle!\n");
                }
                else
                {
                    printf("Ordinary triangle!\n");
                }
            }
            else
            {
                printf("Not a triangle!\n");
            }
        }
        return 0;
    }