#include<stdio.h>
int main()
{
    int a,b,c;
    scanf("%d%d%d",&a,&b,&c);
    //check for invalid input
    if(a<=0||b<=0||c<=0)
    {
        printf("Invalid input");
    }
     //check for Equilateral
     else if(a==b && b==c)
     {
         printf("Equilateral");
     }
     //check for Isosceles
     else if(a==b||b=c||a==c)
     {
         printf("Isosceles");
     }
     //else,it's scalene
     else
     {
         printf("scalene")
     }
}