#include <iostream>
#include <string>
using namespace std;
 
string reverse(string::iterator& it)
{
	char head=*it;
	++it;
	if(head=='b' || head=='w')
		return string(1,head);
	string upperLeft=reverse(it);
	string upperRight=reverse(it);
	string lowerLeft=reverse(it);
	string lowerRight=reverse(it);
 
	return string("x")+lowerLeft+lowerRight+upperLeft+upperRight;
}
 
int main() {
	string s="xwwwb";
	string::iterator it=s.begin();
	it++;
	cout<<string(1,*it);
}

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