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 PHP (5.6.30) (judge verdict: Wrong Answer)

<?php
$input = trim(fgets(STDIN));
if ($input < 100 || $input > 999 ) {
    exit(1);
}
$length = strlen($input);
for($i=0;$i<$length;$i++) {
    $keta[] = substr($input, $i, 1);
}
$level = $keta[0];
for($i=1;$i<3;$i++){
    if($level < $keta[$i]){
        $level = $keta[$i];
    }
}
echo $level.$level.$level;