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#include <iostream>
#include <fstream>
using namespace std;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int main(){
int m,n,c=0,vv=0,ii=0;
in >>m>>n;
int a[m],b[n],dd[n];
for(int i=0;i<m;i++){
in >>a[i];
}
for(int i=0;i<n;i++){
in >>b[i];
}
for(int i=0;i<m;i++){
for(int j=ii;j<n;j++){
if(a[i] == b[j]){
c++;
dd[vv]=a[i];
vv++;
ii=j;
}
}
}
out <<c<<"\n";
for(int i=0;i<vv;i++){
out <<dd[i]<<" ";
}
}