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#include <fstream>
#include <algorithm>
#include <vector>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
const int nmax=1030;
int a[nmax];
int b[nmax];
int dp[nmax][nmax];
void afis (int i, int j, int k)
{
if (i==0 || j==0)
{
fout << k << '\n';
return;
}
if (a[i]==b[j])
{
afis(i-1,j-1,k+1);
fout << a[i] << " ";
}
else if (dp[i-1][j]>dp[i][j-1])
afis(i-1,j,k);
else
afis(i,j-1,k);
}
int main()
{
int n,m,i,j;
fin>>n>>m;
for(i=1;i<=n;i++)
{
fin>>a[i];
}
for(i=1;i<=m;i++)
{
fin>>b[i];
}
for(i=1;i<=n;i++)
{
for(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];
afis(n,m,0);
return 0;
}