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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int m,n,a[1025], b[1025], c[1025][1025], d[1025], k;
void citireDate()
{
f>>m>>n;
for(int i=1;i<=m;i++) f>>a[i];
for(int i=1;i<=n;i++) f>>b[i];
}
void formareMatriceDrum()
{
for(int i=1;i<=m;i++)
for(int j=1;j<=n;j++)
if(a[i]==b[j]) c[i][j]=c[i-1][j-1] + 1;
else c[i][j]=max(c[i][j-1], c[i-1][j]);
}
void interpretareDrum()
{
int i=m, j=n;
while(i && j)
{
if(a[i]==b[j])
{
d[++k]=a[i];
i--;
j--;
}
else if(c[i-1][j] > c[i][j-1]) i--;
else j--;
}
}
void afisareDate()
{
g<<c[m][n]<<'\n';
for(int i=k;i>=1;i--) g<<d[i]<<" ";
}
int main()
{
citireDate();
formareMatriceDrum();
interpretareDrum();
afisareDate();
return 0;
}