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#include <iostream>
#include <algorithm>
#include <string>
#include <set>
#include <map>
#include <vector>
#include <math.h>
 
typedef long long LL;
 
using namespace std;
 
const int N = 107;
 
string a;
string b;
 
int d[N][N];
int w[N][N];
 
int D(int x, int y)
{
	if (x == a.size() || y == b.size())
		return 0;
 
	int &res = d[x][y];
	if (res != -1)
		return res;
	res = 0;
	if (a[x] == b[y])
		res = 1 + D(x + 1, y + 1);
	{
		int t = D(x, y + 1);
		if (res < t)
		{
			res = t;
			w[x][y] = 1;
		}
	}
	{
		int t = D(x + 1, y);
		if (res < t)
		{
			res = t;
			w[x][y] = 2;
		}
	}
	return res;
}
 
string W(int x, int y) {
	if (x == a.size() || y == b.size())
		return "";
	switch (w[x][y])
	{
	case 0: return a[x] + W(x + 1, y + 1);
	case 1: return W(x, y + 1);
	case 2: return W(x + 1, y);
	}
	return "";
}
 
int main()
{
	cin >> a >> b;
 
	memset(d, 0xFF, sizeof(d));
 
	cout << D(0, 0) << "\n";
	cout << W(0, 0) << "\n";
 
 
	return 0;
}

prog.cpp: In function ‘int D(int, int)’:
prog.cpp:24:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if (x == a.size() || y == b.size())
                  ^
prog.cpp:24:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if (x == a.size() || y == b.size())
                                   ^
prog.cpp: In function ‘std::string W(int, int)’:
prog.cpp:53:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if (x == a.size() || y == b.size())
                  ^
prog.cpp:53:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if (x == a.size() || y == b.size())
                                   ^
prog.cpp: In function ‘int main()’:
prog.cpp:68:27: error: ‘memset’ was not declared in this scope
  memset(d, 0xFF, sizeof(d));
                           ^

Standard output is empty