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#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m,ct;
int a[1050],b[1050], d[1050][1050], v[1050];
int main(){
fin>>n>>m;
for(int i=1;i<=n;++i) fin>>a[i];
for(int i=1;i<=m;++i) fin>>b[i];
for(int i=1;i<=n;++i)
for(int j=1;j<=m;++j){
if(a[i]==b[j]) d[i][j]=d[i-1][j-1]+1;
else d[i][j]=max(d[i-1][j],d[i][j-1]);
}
int i=n;
int j=m;
while(d[i][j]>0){
while(d[i][j]==d[i-1][j]) --i;
while(d[i][j]==d[i][j-1]) --j;
v[++ct]=a[i];
--i;
--j;
}
fout<<d[n][m]<<'\n';
for(int h=ct;h>=1;--h) fout<<v[h]<<' ';
return 0;
}