#include<stdio.h>
int main(){
    int N,found=0;
    scanf("%d",&N);
    if(N<0){
        printf("Invalid input");
        return 0;
    }
    int arr[N];
    for(int i=0;i<N;i++){
        scanf("%d",&arr[i]);
    }
    for(int i=0;i<N;i++)
    for(int j=i+1;j<N;j++){
            if(arr[i]==arr[j]){
                printf("%d ",arr[i]);
                found=1;
                break;
            }
        }
        if(!found){
            printf("No duplicates found");
        }
    }
    return 0;
}