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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
const int NMAX=(1<<10)+1;
int a[NMAX],b[NMAX],dp[NMAX][NMAX],n,m,sol[NMAX];
inline void D(int i,int j)
{
if(i==0 || j==0)
return ;
if(a[i]==b[j])
{
D(i-1,j-1);
fout<<a[i]<<" ";
}
else if(dp[i-1][j]<dp[i][j-1])
D(i,j-1);
else D(i-1,j);
}
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=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";
D(n,m);
fin.close();
fout.close();
return 0;
}