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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int d[1030][1030], idx=0, sol[1030];
int main()
{
int n, m;
fin >> n >> m;
int a[n+1], b[m+1];
for(int i=1; i<=n; i++) {
fin >> a[i];
}
for(int i=1; i<=m; i++) {
fin >> 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]);
}
}
}
int i=n, j=m;
while(i>0 && j>0) {
if(a[i]==b[j]) {
sol[idx]=a[i];
i--;
j--;
idx++;
}
if(d[i][j-1]>d[i-1][j]) {
j--;
} else {
i--;
}
}
fout << idx << "\n";
for(i=idx-1; i>=0; i--) {
fout << sol[i] << " ";
}
return 0;
}