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