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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
short v[1025][1025],a[1025],b[1025];
void afis(int pas,int i,int j)
{
if(pas==0)return;
else
{
if(a[j]==b[i])
{
afis(pas-1,i-1,j-1);
fout<<b[i]<<' ';
}
if(a[j]!=b[i])
{
if(v[i-1][j]>=v[i][j-1])
{
afis(pas,i-1,j);
}
else afis(pas,i,j-1);
}
}
}
int main()
{
int i,n,j,m,s=0;
fin>>n>>m;
for(i=1; i<=n; i++)
fin>>a[i];
for(i=1; i<=m; i++)
fin>>b[i];
for(i=1; i<=m; i++)
{
for(j=1; j<=n; j++)
{
if(b[i]==a[j])v[i][j]=v[i-1][j-1]+1;
else v[i][j]=max(v[i-1][j],v[i][j-1]);
}
}
fout<<v[m][n]<<'\n';
afis(v[m][n],m,n);
}