#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;
}