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#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,m,a[1025],b[1025],c[1025][1025];
void afisare (int i,int j)
{ if(i>=1&&j>=1)
if(a[i]!=b[j]) if(c[i-1][j]>c[i][j-1]) afisare(i-1,j);
else afisare (i,j-1);
else {afisare(i-1,j-1);
g<<a[i]<<" ";
}
}
int main()
{ int i,j;
f>>m>>n;
for(i=1;i<=m;i++)
f>>a[i];
for(i=1;i<=n;i++)
f>>b[i];
c[0][0]=0;
for(i=1;i<=m;i++)
for(j=1;j<=n;j++)
if(a[i]==b[j]) c[i][j]=c[i-1][j-1]+1;
else if(c[i-1][j]>c[i][j-1]) c[i][j]=c[i-1][j];
else c[i][j]=c[i][j-1];
g<<c[m][n]<<endl;
afisare(m,n);
return 0;
}