s=list(map(eval,input().split())) s.sort() a,b,c=s[-1],s[-2],s[-3] if b+c>a: if a==b==c: print('Equilateral triangle') if a==b!=c or a!=b==c or a==c!=b: print('Isosceles triangle') if bb+cc>aa: print('Acute triangle') if bb+cc==aa: print('Right triangle') if bb+cc<a*a: print('Obtuse triangle') else: print('Not triangle')