#include <iostream>
#include <string>
using namespace std;

int main() {
	string a;
	string b = "     ";
	
	a[0] = 'h';
	a[1] = 'i';
	
	b[0] = 'h';
	b[1] = 'i';
	
	cout << "a contains " << a << endl; //a does not work!
	cout << "b contains " << b << endl;
}