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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int a[1050],b[1050],d[1050],n,m,c[1050][1050],k;
void citire()
{int i,j;
fin>>n>>m;
for(i=1;i<=n;i++)
fin>>a[i];
for(j=1;j<=m;j++)
fin>>b[j];
}
void comun()
{int i,j;
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
if(a[i]==b[j])
c[i][j]=1+c[i-1][j-1];
else c[i][j]=max(c[i-1][j],c[i][j-1]);
}
void sir()
{int i,j;
k=0;
i=n;j=m;
while(c[i][j]!=0)
if(a[i]==b[j]){
k++;
d[k]=a[i];
i--;j--;
}else if(c[i][j]==c[i-1][j])i--;
else j--;
fout<<k<<endl;
for(i=k;i>=1;i--)
fout<<d[i]<<' ';
}
int main()
{
citire();
comun();
sir();
}