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