#include <stdio.h>
int main()
{
    int a, b, c;
    scanf("%d %d %d", &a, &b, &c);
    if (a + b <= c || a + c <= b || b + c < =a)
        printf("Not triangle\n");
    else
    {
        if (a * a + b * b == c * c || b * b + c * c == a * a || a * a + c * c == b * b)
            printf("Right triangle\n");
        if (a * a + b * b > c * c && b * b + c * c > a * a && a * a + c * c > b * b)
            printf("Acute triangle\n");
        if (a * a + b * b < c * c || b * b + c * c < a * a || a * a + c * c < b * b)
            printf("Obtuse triangle\n");
        if ((a == b &&b!= c )||( b == c&&b != a) ||( c == a &&a!= b))
            printf("Isosceles triangle\n");
        if (a == b&&b == c)
            printf("Equilateral triangle\n");
    }

    return 0;
}