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#include <fstream>
#include<iostream>
//ifstream in("cmlsc.in");
//ofstream out("cmlsc.out");
using namespace std;
int a[1025],b[1025],c[1025][1025],m,n,v[1025],k;
int main(){
int i,j;
cin>>n>>m;
for(i=1;i<=m;i++)cin>>a[i];
for(j=1;j<=n;j++)cin>>b[j];
for(i=1;i<=m;i++)
for(j=1;j<=n;j++)
if(a[i]==b[j])c[i][j]=c[i-1][j-1]+1;
else if(c[i-1][j]>=c[i][j-1])c[i][j]=c[i-1][j];
else c[i][j]=c[i][j-1];
cout<<c[n][m]<<endl;
i=n;
j=m;
k=c[n][m];
while(i&&j){
if(a[i]==b[j]){
v[k--]=a[i];
i--;
j--;
}
else
if(c[i-1][j]>=c[j][j-1])i--;
else j--;
}
k=c[n][m];
for(i=1;i<=k;i++)
cout<<v[i]<<" ";
return 0;
}