#include <iostream>
#include <string>

using namespace std;

string& and_(string& s, const string& s1, const string& s2) 
{
	if (s1.length()> s1.length())
	{
		for (int i = 0; i < s1.length(); i++)
		{
			if (s1[i]==s2[i])
			{
				s += s1[i];
			}
		}
		return s;
	}
	else
	{
		for (int i = 0; i < s2.length(); i++)
		{
			if (s1[i] == s2[i])
			{
				s += s2[i];
			}
		}
		return s;
	}
	
}
int main()
{
	char* str_temp = new char[255];
	string* s = new string[255];
	string s1 = "Hello";
	string s2 = "Hell";

	cout << and_(*s, s1, s2) << endl;
	return 0;
}