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#include <fstream>
#define MAX(a,b) (((a)>(b))?(a):(b))
using namespace std;
int m,n,i,v1[1030],v2[1030],j,d[1030][1030],k,rez[1030];
int main()
{
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
f>>m>>n;
for(i=1;i<=m;i++)
f>>v1[i];
for(i=1;i<=n;i++)
f>>v2[i];
for(i=1;i<=m;i++)
for(j=1;j<=n;j++)
{
if(v1[i]==v2[j])
d[i][j]=d[i-1][j-1]+1;
else
d[i][j]=MAX(d[i-1][j],d[i][j-1]);
}
for(i=m,j=n;i;)
{
if(v1[i]==v2[j])
{
rez[++k]=v1[i];
i--;
j--;
}
else if(d[i-1][j]<d[i][j-1])
j--;
else
i--;
}
g<<d[m][n]<<"\n";
for(i=k;i>=1;i--)
g<<rez[i]<<" ";
}