#include<stdio.h>
int main(){
    int a,b,c,t,m,n;
    scanf("%d %d %d",&a,&b,&c);
    if(a>b){
        t=a;a=b;b=t;
    }
    if(a>c){
        t=a;a=c;c=t;
    }
    if(b>c){
        t=b;b=c;c=t;
    }
    m=a*a+b*b;n=c*c;
    if(a+b<=c){
        printf("Not triangel\n");
        return 0;
    } 
    if(m==n){
        printf("Right triangle\n");
    } 
    if(m>n){
        printf("Acute triangle\n");
    }
    if(m<n){
        printf("Obtuse triangle\n");
    }
    if(a==b||a==c||b==c){
        printf("Isosceles triangle\n");
    }
    if(a==b&&a==c){
        printf("Equilateral triangle\n");
    }
    return 0;
}