#include <iostream>
using namespace std;
/*Esercizio 2 ) L'utente deve continuare a inserire dei caratteri fino a che non inserisce uno 
dopo l'altro due caratteri consecutivi ( ad esempio si ferma dopo aver letto )*/
char c1,c2;
 
int main(){
	cin>>c1;
	cin>>c2;
	while (c1+1!=c2) // (c2-c1 == 1) questa sta a indicare che si differeziano per 1 unità perchè normalmente
	                    // non sono consecutivi
	{
		cin>>c1;
		cin>>c2;
	}
	cout<<c1<<" "<<c2<<endl;
 
	return 0;
}

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IHEgdyByIHQgIGcgIGIgYSBiIA==

 q w r t  g  b a b