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#include <bits/stdc++.h>
using namespace std;
ifstream fin ("cmslc.in");
ofstream fout ("cmslc.out");
int n, m, a[1030], b[1030], dp[1030][1030];
void afis (int i, int j, int k)
{
if (i==0 || j==0)
{
fout << k << '\n';
return;
}
if (a[i]==b[j])
{
afis(i-1,j-1,k+1);
fout << a[i] << " ";
}
else if (dp[i-1][j]>dp[i][j-1])
afis(i-1,j,k);
else
afis(i,j-1,k);
}
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];
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]);
}
}
afis(n,m,0);
return 0;
}