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#include <fstream>
using namespace std;
int main() {
ifstream cin("cmlsc.in");
ofstream cout("cmlsc.out");
int n,m,max=0,k=1;
cin>>n>>m;
int a[1024],b[1024],c[1024];
for (int i=1; i<=n; i++){
cin>>a[i];
}
for (int i=1; i<=m; i++){
cin>>b[i];
}
if (n>m) {
for (int i=1; i<=n; i++) {
for (int j=1; j<=m; j++) {
if (b[j]==a[i]) {
max++;
c[k]=b[j];
k++;
}
}
}
}
else {
for (int i=1; i<=m; i++) {
for (int j=1; j<=n; j++) {
if (b[j]==a[i]) {
max++;
c[k]=b[j];
k++;
}
}
}
}
cout<<max<<"\n";
for (int i=1; i<=k-1; i++){
cout<<c[i];
}
return 0;
}