#include<stdio.h>

int main(){
    int n, m;
    scanf("%d", &n);
    
    if(n<=0) {
        printf("Invalid input");
        return 0;
        
    }
    int arr1[n];
    for(int i=0; i<n; i++){
        scanf("%d", &arr1[i]);
        
    }
    scanf("%d", &m);
    if(m<=0){
        printf("Invalid input");
        return 0;
    }
    int arr2[m];
    for (int i=0; i<m; i++) {
        scanf("%d", &arr2[i]);
    }
    int found=0;
    int*p1=arr1;
    int*p2r=arr2;
    
    for(int i=0; i<n; i++) {
        for(int j=0; j<m; j++){
            if(*(p1+i)==*(p2+j)){
                printf("%d", *(p1+i));
                found=1;
                break;
            }
        }
    }
    if(!found) {
        printf("No common elements");
        
    }
    return 0;
}