#include<stdio.h>
int main()
int a,b,c
scanf("%d %d %d",&a,&b,&c);
if(a<=||b<=0||c<=0);
printf("invalid iput");
else if(a==b)&&b==c){
    printf("Equilateral");}
    else if(a==b||b==c||a==c){
        printf("isoceles");
        else{
        printf("scalene");}
        return 0;
        }