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