data = list(map(float, input().split( )))
data.sort(reverse=True)
a,b,c = data
if a>=b+c:
print("NAO FORMA TRIANGULO")
elif a**2 == b**2 + c**2:
print("TRIANGULO RETANGULO")
elif a**2 > b**2 + c**2:
print("TRIANGULO OBTUSANGULO")
elif a**2 < b**2 + c**2:
print("TRIANGULO ACUTANGULO")
if a==b and a==c and b==a and b==c and c==a and c==b:
print("TRIANGULO EQUILATERO")
elif a==b or a==c or b==a or b==c or c==a or c==b:
print("TRIANGULO ISOSCELES")