def main():
    N = int(input())
    C = list(map(int, input().split()))
    nums = []
    for i, c in enumerate(C):
        if c > 0:
            for _ in range(c):
                nums.append(i + 1)

    n = sorted(nums, reverse=True)
    print(''.join(map(str, n)))

if __name__ == '__main__':
    main()