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#include <bits/stdc++.h>
#define dim 1040
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m,a[dim],b[dim],d[dim][dim],i,j;
void afis(int i,int j){
if(d[i][j]==0)
return;
if(a[i]==b[j]){
afis(i-1,j-1);
// cout<<i<<" "<<j<<endl;
fout<<a[i]<<" ";
}
else if(d[i][j]==d[i][j-1])
afis(i,j-1);
else afis(i-1,j);
}
int main()
{
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<=n;i++)
for(j=1;j<=m;j++){
if(a[i]==b[j]){
d[i][j]=d[i-1][j-1]+1;
}
d[i][j]=max(d[i][j],max(d[i-1][j],d[i][j-1]));
}
fout<<d[n][m]<<"\n";
afis(n,m);
}