#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;
            }