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#include <stdio.h>
#include <iostream>
#include <fstream>
using namespace std;
int main(){
int ok,m,n, a[1024],b[1024],k,x,maxim,c,l[1024],d[1024];
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
in>>n;
in>>m;
for(int i=0;i<n;i++)
in>>a[i];
for(int j=0;j<m;j++)
in>>b[j];
k=0;
c=m;
ok=1;
while(ok==1){
ok=0;
k=0;
for(int i=m;i>0;i++){
for(int j=c;j>0;j++)
if (b[i]==a[j]) {k++;
c=j;
ok=1;
d[k]=b[i];
break;
}
if(k>maxim) {maxim=k;
for(int i=0;i<maxim;i++)
l[i]=d[i];
}
}
}
out<<maxim<<"\n";
for(int i=0;i<maxim;i++)
out<<l[i]<<" ";
in.close();
out.close();
return 0;
}