#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;
}