#include <studio.h>
int main(){
    int N;
    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]);
    }
    int index = 0;
    for (int i =0;i < N;i++){
        if (arr[i] !=0){
            arr[index++] = arr[i];
        }
    }
    while(index < N){
        arr[index++] = 0;
    }
    for (int i=0; i < N;i++){
        print("%d", arr[i]);
    }
    return 0;
    
}