#include<stdio.h>
void 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!=c){
        printf("Scalene\n");
        return;
    }
    elif (a!=b || b!=c || c!=a){
        printf("Isosceles\n");
        return;
    }
    else if(a=b=c){
        printf("Equilateral\n");
        return;
    }
}