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