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#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int A[1025][1025], i, j, n, m, a[1025], b[1025], v[1025];
int main()
{ f>>n>>m;
for (i=1; i<=n; ++i) f>>a[i];
for (j=1; j<=m; ++j) f>>b[j];
for (i=1; i<=n; ++i)
for (j=1; j<=m; ++j)
if (a[i]==b[j]) A[i][j]=1+A[i-1][j-1];
else A[i][j]=max(A[i-1][j], A[i][j-1]);
i=j=n;
g<<A[n][m]<<'\n';
while (i && j)
{ if (a[i]==b[j])
{ v[++v[0]]=a[i];
--i;
--j;
}
else
{ if (A[i-1][j]>A[i][j-1]) --i;
else --j;
}
}
for (i=v[0]; i>=1; --i) g<<v[i]<<' ';
return 0;
}