#include<stdio.h>
int main()
{
    int side1,sde2,side3;
    scanf("%d %d %d",&side1,&side2,&side3);
    if(side1<=0||side2<=0||side3<=0)
    {
        printf("Invalid Input");
    }
    else if(side1+side2<=side3||side1+side3<=side2||side2+side3<=side1)
    {
        printf("Invalid Input");
    }
    else if(side1==side2&&side2==side3)
    {
        printf("Equilateral");
    }
    else if(side1==side2||side2==side3||side3==side1)
    {
        printf("Isosceles");
    }
    else
    {
        printf("Scalene");
    }
    return 0;
}