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