#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <ctype.h>
#include <string.h>
#include <time.h>
int main(){
    int a, b, c;
    scanf("%d%d%d", &a, &b, &c);
    if(((a + b) > c) && ((a + c) > b) && ((b + c) > a)){
        if((a * a == (b * b + c * c)) || (b * b == (a * a + c * c)) || (c * c == (a * a + b * b))){
            puts("right triangle");
        }
        else if((a * a > (b * b + c * c)) || (b * b > (a * a + c * c)) || (c * c > (a * a + b * b))){
            puts("obtuse triangle");
        }
        else{
            puts("acute triangle");
        }

        if((a == b) && (b == c)){
            puts("equilateral triangle");
        }
        else if((a == b) || (b == c) || (a == c)){
            puts("isosceles triangle");
        }

    }
    else{
        puts("no triangle");
    }
    return 0;
}