题解 | #三角形判断#

while 1:
    try:
        a,b,c = map(int, input().split())
        if a+b>c:
            if a == b and b == c:
                print("Equilateral triangle!")
            elif a == b or a == c or b == c:
                print("Isosceles triangle!")
            else:
                print("Ordinary triangle!")
        else:
            print("Not a triangle!")
    except:
        break