intN;  



	cin>>N;//假如2组



	//2,5;6,7



	//3,7;2,8;4,6



	int tmp,fir,sec;



	char c ='T';



	set<pair(int,int)> st;



	while(N--){



	while(c!='\n'){



	cin>>tmp>>c;   fir = tmp;



	cin>>tmp;  sec = tmp;



	c =getchar();



	    st.emplace(fir,sec);



	  }



	}