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#include <fstream>
using namespace std;
ifstream cin("cmlsc.in");
ofstream cout("cmlsc.out");
int t[1025][1025],dp[1025][1025],a[1025],b[1025],n,m;
void rec(int i,int j){
if(dp[i][j]>0){
if(a[i]==b[j]){
rec(i-1,j-1);
cout<<a[i]<<" ";
}else{
if(t[i][j]==1)
rec(i,j-1);
else
rec(i-1,j);
}
}
}
int main()
{
cin>>n>>m;
for(int i=1;i<=n;i++)
cin>>a[i];
for(int i=1;i<=m;i++)
cin>>b[i];
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
if(a[i]==b[j])
dp[i][j]=dp[i-1][j-1]+1;
else{
if(dp[i][j-1]>dp[i-1][j]){
dp[i][j]=dp[i][j-1];
t[i][j]=1;
}else{
dp[i][j]=dp[i-1][j];
t[i][j]=-1;
}
}
cout<<dp[n][m]<<'\n';
rec(n,m);
return 0;
}