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