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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int dp[1026][1026],n,m,x[1026],y[1026],tata[1026][1026];
void rec(int i,int j){
if(dp[i][j]!=0){
if(x[i]==y[j]){
rec(i-1,j-1);
fout<<x[i]<<" ";
}else
if(tata[i][j]==-1)
rec(i-1,j);
else
rec(i,j-1);
}
}
int main()
{
fin>>n>>m;
for(int i=1;i<=n;i++)
fin>>x[i];
for(int j=1;j<=m;j++)
fin>>y[j];
for(int i=1;i<=n;i++){
for(int j=1;j<=m;j++){
if(x[i]==y[j]){
dp[i][j]=dp[i-1][j-1]+1;
}else{
if(dp[i-1][j]>dp[i][j-1]){
dp[i][j]=dp[i-1][j];
tata[i][j]=-1;
}else{
dp[i][j]=dp[i][j-1];
tata[i][j]=1;
}
}
}
}
fout<<dp[n][m]<<"\n";
rec(n,m);
return 0;
}