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