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