#include<stdio.h>
int main()
{

    int a,b,c;
    scanf("%d%d%d",&a,&b,&c);
    if (a<0){
        if (a==b&&b==c){
        printf("Equilateral");}
        else if (a!=b&&b!=c){
        printf("Scalene");}
        else{
       printf("Isosceles");}}
    else{
    print("Invalid Input");}
}