#include<iostream>
#include <stdio.h>
#include <algorithm>
#include <math.h>
using namespace std;
int main() {
    int a[3];
    for(int i = 0;i<3;i++){
        scanf("%d",&a[i]);
    }
    sort(a,a+3);
    if(a[0]+a[1]<a[2] || a[0]+a[2]<a[1] || a[2]+a[1]<a[0]){
        printf("Not triangle\n");
    }else{
        if(pow(a[0],2)+pow(a[1],2)==pow(a[2],2)) printf("Right triangle\n");
        if(pow(a[0],2)+pow(a[1],2)>pow(a[2],2)) printf("Acute triangle\n");
        if(pow(a[0],2)+pow(a[1],2)<pow(a[2],2)) printf("Obtuse triangle\n");
        if(a[0]==a[1] || a[1] == a[2] || a[0] == a[2]) printf("Isosceles triangle\n");
        if(a[0]==a[1] && a[1] == a[2] && a[0] == a[2]) printf("Equilateral triangle\n");
    }
    
    return 0;
}