[PYTHON] 숫자 역정렬

import sys

import math

# Auto-generated code below aims at helping you parse

# the standard input according to the problem statement.

n = int(input())

q=""

for i in input().split():

    digit = int(i)

    q+=str(digit)

# Write an action using print

# To debug: print("Debug messages...", file=sys.stderr)

print(0 if int(q)==0 else "".join(sorted(q)[::-1]))