#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");
    return 0;
    
}
if(a ==b && b == c){
    printf ("Equilateral");
    
}
else if (a == b || b == c || a == c){
    print("Isosceles");
    
}
else{
    printf("scalene");
    
}
return 0;