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