a,b,c=str(input()).split()
d=int()
if int(b)+int(a)<int(c) or int(a)+int(c)<int(b) or int(b)+int(c)<int(a):
    print("Not triangle")
else:
    d=1
if int(a)**2+int(b)**2==int(c)**2 and int(c)>int(a) and int(c)>int(b) and d==1 or int(c)**2+int(b)**2==int(a)**2 and int(a)>int(c) and int(a)>int(b) and d==1 or int(a)**2+int(c)**2==int(b)**2 and int(b)>int(a) and int(b)>int(c) and d==1:
    print("Right triangle")
if int(a)**2+int(b)**2>int(c)**2 and int(c)>=int(a) and int(c)>=int(b) and d==1 or int(c)**2+int(b)**2>int(a)**2 and int(a)>=int(c) and int(a)>=int(b) and d==1 or int(a)**2+int(c)**2>int(b)**2 and int(b)>=int(a) and int(b)>=int(c) and d==1 or int(a)==int(b)==int(c) and d==1:
    print("Acute triangle")
if int(a)**2+int(b)**2<int(c)**2 and int(c)>=int(a) and int(c)>=int(b) and d==1 or int(c)**2+int(b)**2<int(a)**2 and int(a)>=int(c) and int(a)>=int(b) and d==1 or int(a)**2+int(c)**2<int(b)**2 and int(b)>=int(a) and int(b)>=int(c) and d==1:
    print("Obtuse triangle")
if a==b and d==1 or a==c and d==1 or b==c and d==1:
    print("Isosceles triangle")
if int(a)==int(b)==int(c) and d==1:
    print("Equilateral triangle")