Problem:
Score : 100 points

Problem Statement

Cat Snuke is learning to write characters.
Today, he practiced writing digits 1 and 9, but he did it the other way around.

You are given a three-digit integer n written by Snuke.
Print the integer obtained by replacing each digit 1 with 9 and each digit 9 with 1 in n.

Constraints

111 \leq n \leq 999

n is an integer consisting of digits 1 and 9.

Input

Input is given from Standard Input in the following format:

n

Output

Print the integer obtained by replacing each occurrence of 1 with 9 and each occurrence of 9 with 1 in n.

Sample Input 1

119

Sample Output 1

991

Replace the 9 in the ones place with 1, the 1 in the tens place with 9 and the 1 in the hundreds place with 9. The answer is 991.

Sample Input 2

999

Sample Output 2

111

Solution in PHP7 (7.0.15) (judge verdict: Accepted)

<?php
class In {
    private $array = [];
    private $length = 0;
    private $count = 0;

    function __construct()	{
        while (!feof(STDIN)) {
            $str = trim(fgets(STDIN));
            $this->array = array_merge($this->array, explode(' ', $str));
        }
        $this->length = count($this->array);
    }
    
    public function get(int $i){
        $this->array[$i];
    }

    public function next() {
        return $this->array[$this->count++];
    }
    public function hasNext() {
        return $this->count < $this->length;
    }
    public function nextInt() {
        return (int)$this->next();
    }
    public function nextDouble() {
        return (double)$this->next();
    }
    public function nextString() {
        return (string)$this->next();
    }
}

class Out {
    public static function line($str = "") {
        echo $str . PHP_EOL;
    }
}

$in = new In();
Out::line(str_replace("0", "9", str_replace("9", "1", str_replace("1", "0", $in->nextString()))));