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# include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int m, n, a[1025], b[1025], i, j, mat[1025][1025], v[1025], k;
int main ()
{
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])
mat[i][j]=mat[i-1][j-1]+1;
else mat[i][j]=max(mat[i-1][j], mat[i][j-1]);
i=m; j=n;
while(i>=1 && j>=1)
{
if(a[i]==b[j])
{
v[++k]=a[i];
--i;
--j;
}
else if(mat[i-1][j]<mat[i][j-1]) --j;
else --i;
}
g<<k<<"\n";
for(i=k; i>=1; --i)
g<<v[i]<<" ";
}