#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");
    }
    if(a+b>c&&a+c>b&&b+c>a){
        if(a*a+b*b==c*c||a*a+c*c==b*b||b*b+c*c==a*a){
            printf("Right triangle\n");
        }
        if(a*a+b*b>c*c&&a*a+c*c>b*b&&c*c+b*b>a*a){
            printf("Acute triangle\n");
        }
        if(a*a+b*b<c*c||a*a+c*c<b*b||b*b+c*c<a*a){
            printf("Obtuse triangle\n");
        }
        if(a==b||a==c||c==b){
            printf("Isosceles triangle\n");
        }
        if(a==b&&b==c){
            printf("Equilateral triangle\n");
        }
    }
    return 0;
}