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#include <bits/stdc++.h>
using namespace std;
ifstream fin ("cmlsc.in");
ofstream fout ("cmlsc.out");
int n,m,v1[1025],v2[1025],dp[1025][1025];
int main()
{
fin>>n>>m;
for(int i=1;i<=n;i++)
fin>>v1[i];
for(int i=1;i<=m;i++)
fin>>v2[i];
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
{
if(v1[i]==v2[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]<<endl;
/* for(int i=1;i<=n;i++)
{
fout<<endl;
for(int j=1;j<=m;j++)
fout<<dp[i][j]<<" ";
}*/
int i=n,j=m,x[1025],q=0;
while(i>0 && j>0 && dp[i][j]>0)
{
if(v1[i]==v2[j])
{ x[q]=v1[i];
i--;
j--;
q++;
}
else
{
if(dp[i-1][j]>dp[i][j-1])
i--;
else
j--;
}
}
for(int i=q-1;i>=0;i--)
fout<<x[i]<<" ";
return 0;
}