#include<stdio.h>
int main(){
    int n;
    scanf("%d",&n);
    
    if(n<0){
        printf("Invalid Input");
        return 0;
    }
    int arr1[n];
    int count=0;
    for(int i=0;i<n;i++){
        if(!scanf("%d",&arr1[i])){
            printf("Invalid Input");
            return 0;
        }
    }
    int m;
    scanf("%d",&m);
    if(m<0){
        printf("Invalid Input");
        return 0;
    }
    int arr2[m];
    for(int i=0;i<m;i++){
        if(!scanf("%d",&arr2[i])){
            printf("Invalid Input");
            return 0;
        }
    }
    int found=0
    for(int i=0;i<n;i++){
        for(int j=0;j<m;j++){
            if(arr1[i]==arr2[j]){
                printf("%d ",arr1[i]);
                found=1;
                break;
            }
        }
    }
    if(!found){
        printf("Nocommon elements");
    }
    return 0;
    
        
    
}