# 1045 triangle types
a, b, c = map(float, input().split())
list = sorted([a,b,c], reverse=True)
a = list[0]
b = list[1]
c = list[2]
if a>= (b+c):
print("NAO FORMA TRIANGULO")
elif a*a == (b*b +c*c):
print("TRIANGULO RETANGULO")
elif a*a > (b*b +c*c):
print("TRIANGULO OBTUSANGULO")
elif a*a < (b*b +c*c):
print("TRIANGULO ACUTANGULO")
if a == b and b == c :
print("TRIANGULO EQUILATERO")
elif a==b or b==c:
print("TRIANGULO ISOSCELES")