a, b, c = map(int, input().split())
trilist = [a, b, c]
trilist.sort()
resultlist = []
if trilist[0] + trilist[1] > trilist[2] and trilist[0] + trilist[2] > trilist[1] and trilist[1] + trilist[2] > trilist[
0]:
if pow(trilist[0], 2) + pow(trilist[1], 2) == pow(trilist[2], 2):
resultlist.append("Right triangle")
elif pow(trilist[0], 2) + pow(trilist[1], 2) > pow(trilist[2], 2):
resultlist.append("Acute triangle")
elif pow(trilist[0], 2) + pow(trilist[1], 2) < pow(trilist[2], 2):
resultlist.append("Obtuse triangle")
elif trilist[0] == trilist[1] or trilist[1] == trilist[2]:
resultlist.append("Isosceles triangle")
elif trilist[0] == trilist[1] == trilist[2]:
resultlist.append("Equilateral triangle")
for i in resultlist:
print(i, "\n")
elif trilist[0] + trilist[1] < trilist[2] or trilist[0] + trilist[2] < trilist[1] or trilist[1] + trilist[2] < trilist[
0]:
print("Not triangle")