#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 || a == c){
        printf("Equilateral");
    }
    else {
        printf("Isosceles");
    }else {
        printf("Scalene");
    }
    return 0;
}