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