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#include <fstream>
using namespace std;
ifstream cin("cmlsc.in");
ofstream cout("cmlsc.out");
int dp[1025][1025],a[1025],b[1025];
void afisare(int i, int j)
{
if(dp[i][j]>0)
{
if(a[i]==b[j])
{
afisare(i-1,j-1);
cout<<a[i]<<" ";
}
else
{
if(dp[i-1][j]>=dp[i][j-1])
afisare(i-1,j);
else
afisare(i,j-1);
}
}
}
int main()
{
int n,m,i,j;
cin>>n>>m;
for(i=1;i<=n;i++)
cin>>a[i];
for(i=1;i<=m;i++)
cin>>b[i];
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
if(a[i]!=b[j])
dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
else
dp[i][j]=dp[i-1][j-1]+1;
cout<<dp[n][m]<<'\n';
afisare(n,m);
return 0;
}