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#include <fstream>
#define nmax 1030
using namespace std;
ifstream cin("cmlsc.in");
ofstream cout("cmlsc.out");
int n,m,a[nmax],b[nmax],dp[nmax][nmax];
void rec(int l,int c){
if(dp[l][c]==0)
return ;
if(a[l]==b[c]){
rec(l-1,c-1);
cout<<a[l]<<" ";
}else if(dp[l-1][c]>dp[l][c-1])
rec(l-1,c);
else
rec(l,c-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++){
dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
if(a[i]==b[j])
dp[i][j]=max(dp[i][j],dp[i-1][j-1]+1);
}
cout<<dp[n][m]<<'\n';
rec(n,m);
return 0;
}