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#include<bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m,a[1024],b[1024],i,j,d[1024][1024],l,c[1024];
int main()
{
fin>>n>>m;
for(i=0;i<n;++i)fin>>a[i];
for(i=0;i<m;++i)fin>>b[i];
for(i=0;i<n;++i)
for(j=0;j<m;++j)
if(a[i]==b[j])
d[i][j]=1+d[i-1][j-1];
else d[i][j]=max(d[i-1][j],d[i][j-1]);
for(i=n,j=m;i>=0;)
if(a[i]==b[j])c[l++]=a[i],--i,--j;
else
if(d[i-1][j]<d[i][j-1])--j;
else --i;
fout<<l-1<<"\n";
for(i=l-1;i>=1;--i)fout<<c[i]<<" ";
return 0;
}