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#include <fstream>
#define maxim(a,b) (a>b?a:b)
using namespace std;
fstream f("cmlsc.in",ios::in);
fstream g("cmlsc.out",ios::out);
short m,n,a[1025], b[1025],i,j,k, d[1025][1025], sir[1025], lmax;
void citire()
{
f>>m>>n;
for(i=1; i<=m; i++)
f>>a[i];
for(i=1; i<=n; i++)
f>>b[i];
f.close();
}
void prelucrare()
{
for(i=1; i<=m; i++)
{
for(j=1; j<=n; j++)
if(a[i] == b[j])
{
d[i][j]= 1 + d[i-1][j-1];
}
else
{
d[i][j]= maxim(d[i][j-1], d[i-1][j]);
}
}
for (i = m, j = n; i>0; )
if (a[i] == b[j])
sir[++lmax] = a[i], --i, --j;
else if (d[i-1][j] < d[i][j-1])
--j;
else
--i;
}
void scrie()
{
g<<lmax<<'\n';
for(i=lmax; i>=1; i--)
g<<sir[i]<<' ';
g.close();
}
int main()
{
citire();
prelucrare();
scrie();
return 0;
}