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