#include<stdio.h>
void main()
{ 
 int n1,n2,n3;   
 n1=int(input())
 n2=int(input())
 n3=int(input())
 if(n1<0 or n2<0 or n3<0)
   print("Invalid input");
  elif(n1=n2 or n2=n2 or n3=n2)
   print("Equilateral");
  elif(n1=n2 or n2=n3)
   print("Isosceles");
 else() 
  print("Scalene");
}