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#include <bits/stdc++.h>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int c[1025][1025],a[1025],b[1025],n,m;
void tipar(int i,int j)
{
if (i>=1&&j>=1)
if (a[i]!=b[j])
{
if (c[i][j-1]>c[i-1][j]) tipar(i,j-1);
else tipar(i-1,j);
}
else
{
tipar(i-1,j-1);
g<<a[i]<<' ';
}
}
void solve()
{
int i,j;
for (i=1;i<=n;i++)
for (j=1;j<=m;j++)
if (a[i]==b[j]) c[i][j]=1+c[i-1][j-1];
else c[i][j]=max(c[i-1][j],c[i][j-1]);
g<<c[n][m]<<'\n';
tipar(n,m);
}
void citire()
{
int i;
f>>n>>m;
for (i=1;i<=n;i++) f>>a[i];
for (i=1;i<=m;i++) f>>b[i];
}
int main()
{
citire();
solve();
return 0;
}