a,b,c = list(map(int,input().split())) if a == b == c : print('Equilateral triangle') elif a == b != c or a == c != b or a != b == c: print('Isosceles triangle') elif a < b < c: if a + b <= c and c <= a - b : print('Not triangle') elif a2 + b2 > c2 : print('Acute triangle') elif a2 + b2 == c2: print('Right triangle') else: print('Obtuse triangle')