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#include <bits/stdc++.h>
using namespace std;
int n,m,a[1030],b[1030],dp[1030][1030];
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
void Citire()
{
int i;
fin>>n>>m;
for(i=1;i<=n;i++)
fin>>a[i];
for(i=1;i<=m;i++)
fin>>b[i];
fin.close();
}
inline void Reconst(int i,int j)
{
if(i==0||j==0) return;
if(a[i]==b[j])
{
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);
}
}
void Rez()
{
int i,j;
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][j-1],dp[i-1][j]);
}
fout<<dp[n][m]<<"\n";
Reconst(n,m);
}
int main()
{
Citire();
Rez();
return 0;
}