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#include <fstream>
#define nmax 1025
using namespace std;
ifstream cin("cmlsc.in");
ofstream cout("cmlsc.out");
int n,m,a[nmax],b[nmax],dp[nmax][nmax];
void rec(int i,int j){
if(i==0||j==0)
return ;
if(a[i]==b[j]){
rec(i-1,j-1);
cout<<a[i]<<" ";
return ;
}
if(dp[i-1][j]>dp[i][j-1])
rec(i-1,j);
else
rec(i,j-1);
}
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
dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
cout<<dp[n][m]<<'\n';
rec(n,m);
return 0;
}