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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n, m;
int A[2000];
int B[2000];
int dp[2000][2000];
vector<int> sol;
int main() {
fin >> n >> m;
for (int i = 1; i <= n; i++)
{
fin >> A[i];
}
for (int i = 1; i <= m; i++)
{
fin >> B[i];
}
for (int i = 0; i <= n; i++)
{
dp[i][0] = 0;
}
for (int i = 0; i <= m; i++)
{
dp[0][i] = 0;
}
for (int i = 1; i <= n; i++)
{
for (int j = 1; j <= m; j++)
{
if(A[i] == B[j])
{
dp[i][j] = dp[i - 1][j - 1] + 1;
}
else
{
dp[i][j] = max(dp[i - 1][j], dp[i][j - 1]);
}
}
}
fout << dp[n][m] << '\n';
// for (int i = 0; i <= n; i++)
// {
// for (int j = 0; j <= m; j++)
// {
// cout << dp[i][j] << ' ';
// }
// cout << '\n';
// }
int lin = n, col = m;
int pasi_ramasi = dp[n][m];
while(pasi_ramasi > 0)
{
if(A[lin] == B[col])
{
sol.push_back(A[lin]);
pasi_ramasi--;
lin--;
col--;
}
else
{
if(dp[lin - 1][col] > dp[lin][col - 1])
{
lin--;
}
else
{
col--;
}
}
}
reverse(sol.begin(), sol.end());
for (int i = 0; i < sol.size(); i++)
{
fout << sol[i] << ' ';
}
fin.close();
fout.close();
return 0;
}