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#include <bits/stdc++.h>
using namespace std;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int n,m;
int a[1030],b[1030],d[1030][1030];
void afisare(int l,int c)
{
if(l==0||c==0) return;
if(a[l]==b[c])
{
afisare(l-1,c-1);
out<<a[l]<<" ";
}
else
{
if(d[l-1][c]>d[l][c-1]) afisare(l-1,c);
else afisare(l,c-1);
}
}
int main()
{
in>>n>>m;
for(int i=1;i<=n;i++) in>>a[i];
for(int i=1;i<=m;i++) in>>b[i];
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
{
if(a[i]==b[j]) d[i][j]=d[i-1][j-1]+1;
else d[i][j]=max(d[i-1][j],d[i][j-1]);
}
out<<d[n][m]<<'\n';
afisare(n,m);
return 0;
}