#include<stdio.h>
void findintersection(int *arr1,int n,int *arr2,int m){
    if(n<=0||m<=0){
        printf("invalid input\n");
        return;
    }
    int foundcommon=0;
    for(int i=0;i<n;i++){
        for(int j=0;j<m;j++){
            if(*(arr1+i)==*(arr2+j)){
                int isDuplicate=0;
                for(int k=0;k<i;k++){
                    if(*(arr1+i)==*(arr1+k)){
                        isDuplicate=1;
                        break;
                    }
                }
                if(!isDuplicate){
                    printf("%d",*(arr1+i));
                    foundcommon=1;
                }
                break;
            }
        }
    }
    if(!foundcommon){
    }
    printf("\n");
}
inr main(){
    int n,m;
    scanf("%d",&n);
    int arr1[n];
    for(int i=0;i<n;i++)scanf("%d",&arr[i]);
    scanf("%d",&m);
    int arr2[m];
    for(int i=0;i<m;i++)scanf("%d",&arr2[i]);
    findintersection(arr1,n,arr2,m);
    return 0;
}