#include<stdio.h>
int main;
{
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")
}