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