// editor1
#include<stdio.h>
int main()
{
    int a,b,c;
    scanf("%d %d %d", &a,&b,&c);
    if(a <= 0 || b <= 0 || c <=0)
    {
    printf("Invalid Input");
    else if(a == b && b == c )
    {
        printf("Equilateral");
    }
    else if(a == b || b == c || a==c)
    {
        printf("Isosceles");
    }
    else
    {
        printf("Scalene");
    }
    }