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