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