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#include <fstream>
using namespace std;
ifstream cin("cmlsc.in");
ofstream cout("cmlsc.out");
int v1[1030];
int v2[1030];
int dp[1030][1030];
void afisare_nr (int i, int j){
if (i<0 || j<0){
return;
}
if (dp[i-1][i-1] == dp[i][j] - 1){
afisare_nr(i-1, j-1);
cout<<v1[i]<<" ";
}
else{
if (dp[i-1][j] > dp[i][j-1]){
afisare_nr(i-1, j);
}
else{
afisare_nr(i, j-1);
}
}
}
int main()
{
int n,m;
cin>>n>>m;
for (int i=1; i<=n; i++){
cin>>v1[i];
}
for (int i=1; i<=m; i++){
cin>>v2[i];
}
for (int i=1; i<=n; i++){
for (int j=1; j<=m; j++){
if (v1[i]==v2[j]){
dp[i][j] = dp[i-1][j-1] + 1;
}
else{
dp[i][j] = max(dp[i][j-1], dp[i-1][j]);
}
}
}
cout<<dp[n][m]<<'\n';
afisare_nr(n,m);
return 0;
}