#include <stdio.h> 
int main ()
{ 
int a,b,c;
scanf("%d%d%d",&a,&b,&c);
if (a <= 0|| b <=0 || c <= 0) { 
printf ( "Invalid Input"); 
else if (a == b && b == c) 
{
printf("Equilateral"); 
}
else if (a == b|| b == c ||a == c)
{
printf ("Isosceles");
}
else
{
printf ("Scalene"); 
}
return 0;
}