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