#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("isoceles");
                else{
                    printf("Scalene");
                }
                return 0;
                }
            }
        }
    }
}