a,b,c=map(int,input().split(' '))
if a+b<c or a+c<b or b+c<a:
    print('Not triangle')
if a*a+b*b>c*c or b*b+c*c>a*a or a*a+c*c>b*b:
    print('Acute triangle')
if a*a+b*b<c*c or b*b+c*c<a*a or a*a+c*c<b*b:
    print('Obtuse triangle')
if a*a+b*b=c*c or b*b+c*c=a*a or a*a+c*c=b*b:
    print('Right triangle')
if a=b or a=c or b=c:
    print('Isosceles triangle')
if a=b=c:
    print('Equilateral triangle')

码风不好,多多指教!