#include<stdio.h>
int main()
{
   int n1,n2,n3;
   scanf("%d",&n1);
   scanf("%d",&n2);
   scanf("%d",&n3);
   if(n1==n2 && n2==n3 && n3==n1) {
       printf("Equilateral\n");
   }else if(n1==n2 || n2==n3 || n1==n3) {
       printf("Isoceles\n");
   }else if("n1<0 ||n2<0 ||n3<0") {
       printf("Invalid Input\n");
   }else{
       printf("scalene\n")
   }
   return 0;
}