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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
const int Nmax=1030;
int dp[Nmax][Nmax],a[Nmax],b[Nmax];
void reconst(int i, int j)
{
if(a[i]==b[j])
{
if(dp[i][j]==1)
{
fout<<a[i]<<' ';
return;
}
else reconst(i-1,j-1);
fout<<a[i]<<' ';
}
else
{
if(dp[i-1][j]>dp[i][j-1])
{
reconst(i-1,j);
}
else reconst(i,j-1);
}
}
int main()
{
int n,m;
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=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';
reconst(n,m);
return 0;
}