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