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#include<fstream>
using namespace std;
long n,p,m[1025][1025],a[1025],b[1025],i,j,k,v[1025];
long maxim(long a, long b)
{
if(a>b)
return a;
else
return b;
}
int main()
{
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
f>>n>>p;
for(i=1;i<=n;i++)
f>>a[i];
for(i=1;i<=p;i++)
f>>b[i];
for(i=1;i<=n;i++)
for(j=1;j<=p;j++)
{
if(a[i]==b[j])
{m[i][j]=m[i-1][j-1]+1;
while(j<p)
{
j++;
m[i][j]=m[i][j-1];
}
}
else
m[i][j]=maxim(m[i-1][j],m[i][j-1]);
}
g<<m[n][p]<<'\n';
i--;
j--;
while(i>1 || j>1)
{
if(m[i-1][j]==m[i][j])
{
while(m[i-1][j]==m[i][j])
i--;
while(m[i][j-1]==m[i][j])
j--;
}
else if(m[i][j-1]==m[i][j])
{
while(m[i][j-1]==m[i][j])
j--;
while(m[i-1][j]==m[i][j])
i--;
}
v[++k]=a[i];
i--;
j--;
}
for(i=k;i>=1;i--)
g<<v[i]<<" ";
return 0;
}