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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int a[2005],b[2005];
int dp[1050][1050];
int n,m;
int main()
{
int i,j;
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] = dp[i-1][j-1] +1;
else dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
}
}
fout << dp[n][m] <<"\n";
i=n;j=m;
while(i>=1 && j>=1){
if(a[i]==b[j]){
fout << a[i]<< " ";
i--;j--;
}
if(dp[i-1][j]<dp[i][j-1]){
j--;
}
else{
i--;
}
}
fin.close();
fout.close();
return 0;
}