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