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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
short n,m,i,j,dp[1025][1025],a[1025],b[1025],s[1025],k,mx;
int main()
{
fin>>n>>m;
for(i=1;i<=n;i++)
fin>>a[i];
for(i=1;i<=m;i++)
fin>>b[i];
for(i=1;i<=n;i++){
for(j=1;j<=m;j++){
if(a[i]==b[j]) dp[i][j]=1+dp[i-1][j-1];
else dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
}
}
i=n;
j=m;
mx=dp[n][m];
while(mx>0){
if(a[i]==b[j]){
s[++k]=a[i];
i--;
j--;
mx--;
}
else if(dp[i-1][j]==mx) i--;
else j--;
}
fout<<dp[n][m]<<'\n';
for(i=k;i>=1;i--)
fout<<s[i]<<' ';
fin.close();
fout.close();
return 0;
}