#include <stdio.h>
int main() {
    int a,b,c;
    scanf(%d %d %d,&a,&b,&c);
    if (a<=0||b <=0||c<=0||
        (a+b<=c)||(a+c<=b)||(b+c<=a)) {
         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;
    
}