#include<stdio.h>
int main(){
    int s1,s2,s3;
    printf("enter the values");
    scanf("%d%d%d",s1,s2,s3);
 if(s1<=0 || s2<=0 || s3<=0){
 printf("Invalid input");
     
 }
  else if(s1+s2<=0 || s2+23<=0 || s1+s3<=0){
      printf("Invalid input");
      
  }
      
  if(s1==s2 && s2==s3){
      printf("Equilateral");
  }else if("s1==2 || s2==s3 || s3==s1"){
      printf("Isosceles");
  }else{
  printf("Scalene");
  } 
  return 0;
}