#include <stdio.h>

int main() {
	unsigned int a, b, c;
	scanf("%d %d %d", &a, &b, &c);
	if (a + b <= c || a + c <= b || b + a <= c) {
		printf("Not triangle\n");

	}
	else {
		int t = 0; if (a > b) {
			t = b;
			b = a;
			a = t;
		}
		if (a > c) {
			t = c;
			c = a;
			a = t;
		}if (b > c) {
			t = c;
			c = b;
			b = t;
		}if (a * a + b * b > c * c) { printf("Acute triangle\n"); }
		else if (a * a + b * b < c * c) {
			printf("Obtuse triangle\n");
		}
		else if (a * a + b * b == c * c) { printf("Right triangle\n"); }
		if (a == b || b == c || a == c) { printf("Isosceles triangle\n"); }
		 if (a == b && b == c) { printf("Equilateral triangle\n"); }
	}return 0;
}