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