题解 | #三角形判断#

import sys

for line in sys.stdin:
    a, b, c = map(int, line.split())
    if a + b > c and a + c > b and b + c > a:
        if a == b == c:
            print("Equilateral triangle!")
        elif a == b or b == c or a == c:
            print("Isosceles triangle!")
        else:
            print("Ordinary triangle!")
    else:
        print("Not a triangle!")