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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
short N,M,a[1040],b[1040],i,j,m[1040][1040],nr,q[1024];
int main()
{
fin>>N>>M;
for(i=1;i<=N;i++)
fin>>a[i];
for(j=1;j<=M;j++)
fin>>b[j];
for(i=1;i<=N;i++)
{
for(j=1;j<=M;j++)
{
if(a[i]==b[j])
{
m[i][j]=m[i-1][j-1]+1;
}
else
{
m[i][j]=max(m[i-1][j],m[i][j-1]);
}
}
}
fout<<m[N][M]<<'\n';
nr=m[N][M];
for(i=N;i>=1;i--)
{
for(j=M;j>=1;j--)
{
if(a[i]==b[j]&&m[i][j]==nr)
{
q[nr]=a[i];
nr--;
}
}
}
for(i=1;i<=m[N][M];i++)
{
fout<<q[i]<<' ';
}
}