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#include <iostream>
#include <fstream>
using namespace std;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int n,m,a[1050][1050],b[1050],c[1050],sol[2005];
int main()
{
in>>n>>m;
for(int i=1;i<=n;i++)
{
in>>b[i];
}
for(int i=1;i<=m;i++)
{
in>>c[i];
}
for(int i=1;i<=n;i++)
{
for(int j=1;j<=m;j++)
{
if(b[i]==c[j])a[i][j]=a[i-1][j-1]+1;
else a[i][j]=max(a[i-1][j],a[i][j-1]);
}
}
out<<a[n][m]<<'\n';
int x=n,y=m,ind=0;
while(a[x][y]!=0)
{
if(b[x]==c[y])sol[++ind]=b[x],x--,y--;
else if(a[x-1][y]>a[x][y-1])x--;
else y--;
}
for(int i=ind;i>0;i--)
{
out<<sol[i]<<' ';
}
return 0;
}