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#include <fstream>
#include <algorithm>
#include <stack>
#define NMAX 1050
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,m,i,j,x;
int v[NMAX],w[NMAX],a[NMAX][NMAX];
stack < int > s;
int main()
{
f>>n>>m;
for(i=1;i<=n;i++)
{
f>>v[i];
}
for(i=1;i<=m;i++)
{
f>>w[i];
}
for(i=1;i<=n;i++)
{
for(j=1;j<=m;j++)
{
if(v[i]==w[j])
a[i][j]=a[i-1][j-1]+1;
else
{
x=max(a[i-1][j-1],a[i-1][j]);
x=max(x,a[i][j-1]);
a[i][j]=x;
}
}
}
g<<a[n][m]<<"\n";
i=n;j=m;
while(i>0&&j>0)
{
if(v[i]==w[j])
{
s.push(v[i]);
i--;j--;
}
else
{
if(a[i-1][j-1]>a[i-1][j])
{
if(a[i-1][j-1]>a[i][j-1])
{
i--;j--;
}
else
{
j--;
}
} else
{
if(a[i-1][j]>a[i][j-1])
i--;
else
j--;
}
}
}
while(!s.empty())
{
g<<s.top()<<" ";
s.pop();
}
}