Chewbaсca and Number

题面翻译

Luke Skywalker给了Chewbacca一个正整数$x$ ，但是Chewbacca决定把这个数改掉。他可以把整数$x$ 每个位置上的数$t$ 改成$9-t$ 。 请你帮助Chewbacca来计算一下，如何把$x$ 改成一个最小的正整数，注意，不能出现首位为$0$ 的情况。

输入范围

输入一个正整数$x(1\leq x\leq 10^{18})$ ，表示初始的数。

输出范围

输出最小可以改变的数，注意不能出现首位为$0$ 的情况。

感谢@馒头精 提供的翻译

题目描述

Luke Skywalker gave Chewbacca an integer number $x$ . Chewbacca isn't good at numbers but he loves inverting digits in them. Inverting digit $t$ means replacing it with digit $9-t$ .

Help Chewbacca to transform the initial number $x$ to the minimum possible positive number by inverting some (possibly, zero) digits. The decimal representation of the final number shouldn't start with a zero.

输入格式

The first line contains a single integer $x$ $(1<=x<=10^{18})$ — the number that Luke Skywalker gave to Chewbacca.

输出格式

Print the minimum possible positive number that Chewbacca can obtain after inverting some digits. The number shouldn't contain leading zeroes.

样例 #1

样例输入 #1

27

样例输出 #1

22

样例 #2

样例输入 #2

4545

样例输出 #2

4444