a,b,c=map(int,input().split())

if a<=0 or b<=0 or c<=0 : print('Not triangle') else : if a+b>c and b+c>a and a+c>b : if aa+bb==cc or aa+cc==bb or cc+bb==aa : print('Right triangle') elif aa+bb<cc or aa+cc<bb or cc+bb<aa : print('Obtuse triangle') else : print('Acute triangle')

	if a==b==c:
		print('Equilateral triangle')
	elif a==b or b==c or 1==c:
		print('Isosceles triangle')

else :
	print('Not triangle')