alg_1_1

#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define MAX 10000
using namespace std;

int *a, *b, *c, sizeA, sizeB, sizeC=0;

void inters (){
    for(int j=0, i=0; i<sizeA;) {
        if(a[i] < b[j]) {
            i++;
            continue;
        }
        if(a[i] == b[j]) {
            c[sizeC] = a[i];
            sizeC++;
            i++;
            j++;
            continue;
        }
        if(a[i] > b[j]) {
            j++;
        }
    }
}

void genInput () {
     int n=MAX, m=MAX, i,v;
   srand((unsigned)time(NULL));
   printf("%d %d\n",m,n); v=rand()%10+1;
   for(i=1;i<m;i++)
   {  printf("%d ",v); v+=rand()%10+1; }
   printf("%d\n",v); v=rand()%10+1;
   for(i=1;i<n;i++)
   {  printf("%d ",v); v+=rand()%10+1; }
   printf("%d\n",v);
}

int main()
{
  // genInput();
  cin >> sizeA;
  cin >> sizeB;

  a = new int [sizeA];
  b = new int [sizeB];
  c = new int [sizeA>sizeB ? sizeA: sizeB];

  for(int i=0; i<sizeA; i++) cin>> a[i];
  for(int i=0; i<sizeB; i++) cin>> b[i];

  inters();
  for(int i=0; i<sizeC; i++) {
          if(i==0) {
                   cout<< c[i] ;
                   continue;
                   }
           cout<< ", "<<c[i] ;
           }

  return 0;
}