// editor1
#include<stdio.h>
int main(){
 int a, b, c;
 scanf("%d %d %d",&a, &b, &c);
 if(a <= 0 ||b <= 0 ||c <= 0){
     printf("Invaild input");
     
 }
     else if("a == b && b == c"){
         printf("equilatiral");
         
     }
         else if( a == b || b == c || a == c){
         printf("isoceles");
         }
         else{
             printf("scalence")
         }
         return 0;
}