https://www.luogu.com.cn/problem/P5717

"""
P5717 【深基3.习8】三角形分类（python3实现）
https://www.luogu.com.cn/problem/P5717
"""

import sys

a=list(map(int,input().split()))

a.sort()

if a[0]+a[1]<=a[2]:
            print("Not triangle")
            sys.exit(0)
            

if a[2]*a[2]==a[1]*a[1]+a[0]*a[0]:
            
            print("Right triangle")
            sys.exit(0)

if(a[2]*a[2]>(a[1]*a[1]+a[0]*a[0])):
            
            print("Obtuse triangle")


if(a[2]*a[2]<(a[1]*a[1]+a[0]*a[0])):
            
            print("Acute triangle");


if(a[1]==a[0] or a[2]==a[1] or a[0]==a[2]):
            
            print("Isosceles triangle");


if a[1]==a[2] and a[0]==a[1]:
            
            print("Equilateral triangle")