ls=list(map(int,input().split())) ls.sort() a,b,c=ls[0],ls[1],ls[2] if a<=0 or b<=0 or c<=0: print("Not triangle") elif a+b<=c or c-b>=a or c-a>=b: print("Not triangle") else: if a==b or b==c or a==c: print("Isosceles triangle") if a==b==c: print("Equilateral triangle") if a2+b2==c2 : print("Right triangle") if a2+b2<c2: print("Acute triangle") if a2+b2>c**2: print("Obtuse triangle")