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