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#include <fstream>
using namespace std;
int d[1024][1024], a[1024], b[1024], s[1025];
int main(){
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n, m;
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++){
d[i][j]=max(d[i-1][j-1]+(a[i]==b[j]), d[i][j]);
d[i][j]=max(d[i][j], d[i][j-1]);
d[i][j]=max(d[i][j], d[i-1][j]);
}
}
fout<<d[n][m]<<endl;
int i=n, j=m, cnt=0;
while(i>=1&&j>=1){
if(a[i]==b[j]){
s[++cnt]=a[i];
i--, j--;
}
else{
if(d[i][j]==d[i-1][j])
i--;
else j--;
}
}
for(int k=cnt; k>=1; k--)
fout<<s[k]<<" ";
return 0;
}