while True:
    try:
        a,b,c=map(int,input().split())
        if a+b<=c or a+c<=b or b+c<=a:
            print("Not a triangle!")
        elif a==b==c:
            print("Equilateral triangle!")
        elif a==b or a==c or b==c:
            print("Isosceles triangle!")
        else:
            print("Ordinary triangle!")
    except:
        break