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