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#include<fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int b[1030],c[1030][1030],a[1030],x[1030],m,n,i,j,k;
char d[1030][1030];
int main()
{
fin>>m>>n;
for(i=1;i<=m;i++)
{
fin>>a[i];
}
for(i=1;i<=n;i++)
{
fin>>b[i];
}
for(i=1;i<=m;i++)
for(j=1;j<=n;j++)
{
if(a[i]==b[j])
{
c[i][j]=1+c[i-1][j-1];
d[i][j]='\\';
}
else
{
if(c[i-1][j]>c[i][j-1])
{
c[i][j]=c[i-1][j];
d[i][j]='|';
}
else
{
c[i][j]=c[i][j-1];
d[i][j]='-';
}
}
}
fout<<c[m][n]<<endl;
i=m;
j=n;
k=0;
while(i>0 && j>0)
{
if(a[i]==b[j])
{
k++;
x[k]=a[i];
}
if(d[i][j]=='\\')
{
i--;
j--;
}
else
{
if(d[i][j]=='|')
{
i--;
}
else
{
j--;
d[i][j]='-';}
}
}
for(i=k;i>=1;i--)
{
fout<<x[i]<<" ";
}
fout.close();
fin.close();
return 0;
}