#include <iostream>
#include <cstring>

using namespace std;

string s1, s2;

int main()
{
	while (cin >> s1 >> s2)
	{
		int res = 0, mxi = 0;
		for (int i = 0; i < s1.size(); i ++ )
			for (int j = 0; j < s2.size(); j ++ )
			{
				int cnt = 0, k = i, t = j;
				while (k < s1.size() && s1[k ++] == s2[t ++]) cnt ++;
				if (cnt >= res) res = cnt, mxi = i;
			} 
		cout << res << endl << s1.substr(mxi, res) << endl;
	}
	return 0;
}