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&&a==c) printf("Equilateral triangle!\n");
else if(a==b||a==c||b==c) printf("Isosceles triangle!\n");
else printf("Ordinary triangle!\n");
}
else printf("Not a triangle!\n");
}
return 0;
}