#include<stdio.h>


void swapw(int *m,int *n)
{
    int t;
    t = *m;
    *m = *n;
    *n = t;
}


int main()
{
    int a, b, c;
    scanf_s("%d%d%d", &a, &b, &c);
    if (a < b) swapw(a, b);
    if (a < c) swapw(a, c);
    if (a<c + b && a>b - c && a > c - b)
    {
        if (a*a==b*b+c*c)
            printf("Right triangle");
        else if (a*a<b*b+c*c)
            printf("Acute triangle");
        else if (a*a>b*b+c*c)
            printf("Obtuse triangle");

        if (a == b || b == c || c == a)
            printf("Isosceles triangle");
        if (a == b && b == c);
            printf("Equilateral triangle");
    }
    else {
        printf("Not triangle");
    }
    return 0;
}