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