#include<stdio.h>
int main(){
    int s1,s2,s3;
    scanf("%d%d%d",&s1,&s2,&s3);
 if(s1<=0 || s2<=0 || s3<=0){
 printf("Invalid input");}
  else if(s1+s2<=0 || s2+s3<=0 || s1+s3<=0){
      printf("Invalid input\n");
      
  }
      
  if(s1==s2 && s2==s3){
      printf("Equilateral\n");
  }else if(s1==s2 || s1==s3){
      printf("Isosceles\n");
  }else
  printf("Scalene");}
  return 0;
}