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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin ("cmlsc.in");
ofstream fout ("cmlsc.out");
int n, m, a[1025], b[1025];
int dp[1025][1025];
void find_sir (int i, int j)
{
if(i==0 || j==0)
return;
if(dp[i][j]==dp[i-1][j-1]+1)
{
find_sir(i-1, j-1);
fout<<a[i]<<" ";
}
else
{
if(dp[i][j]==dp[i-1][j])
find_sir(i-1, j);
else
if(dp[i][j]==dp[i][j-1])
find_sir(i, j-1);
}
}
int main()
{
fin>>n>>m;
for(int i=1; i<=n; i++)
fin>>a[i];
for(int j=1; j<=m; j++)
fin>>b[j];
for(int i=1; i<=n; i++)
{
for(int 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";
find_sir(n, m);
return 0;
}