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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int a[1025],b[1025],c[1025][1025],t[1025];
int M,N;
void cmlsc(int a[],int b[]){
for(int i=1;i<=M;i++)
for(int j=1;j<=N;j++)
if(a[i]==b[j])c[i][j]=c[i-1][j-1]+1;
else c[i][j]=max(c[i-1][j],c[i][j-1]);
}
void traseu(){
int lg=c[M][N];
int i=M,j=N;
while(lg--){
while(a[i]!=b[j] && c[i][j]==c[i-1][j]){i--;}
while(a[i]!=b[j] && c[i][j]==c[i][j-1]){j--;}
t[lg]=a[i];
i--;j--;
}
for(int i=0;i<c[M][N];i++)
g<<t[i]<<' ';
}
int main(){
f>>M>>N;
for(int i=1;i<=M;i++)f>>a[i];
for(int i=1;i<=N;i++)f>>b[i];
cmlsc(a,b);
g<<c[M][N]<<'\n';
traseu();
}