#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{
                            printf("Invalid Input");}
                            return 0
}