#include <stdio.h>
int main()
{
    int n1,n2,n3;
    scanf("%d",&n1);
    scanf("%d",&n2);
    scanf("%d",&n3);
    if(n1<0 && n2<0 && n3<0)
    {
        printf("Invalid input");
    }
    if(n1==n2 && n2==n3 && n3==n1)
    {
        printf("Equilateral");
    }
    if(n1 != n2 && n2 != n3 && n3 != n1)
    {
        printf("Scalene");
    }
    else{
        printf("isosceles")
    }
    return 0;
}