Problem:
Score : 200 points

Problem Statement

For a string S consisting of the uppercase English letters P and D, let the doctoral and postdoctoral quotient of S be the total number of occurrences of D and PD in S as contiguous substrings. For example, if S = PPDDP, it contains two occurrences of D and one occurrence of PD as contiguous substrings, so the doctoral and postdoctoral quotient of S is 3.

We have a string T consisting of P, D, and ?.

Among the strings that can be obtained by replacing each ? in T with P or D, find one with the maximum possible doctoral and postdoctoral quotient.

Constraints

1 \leq |T| \leq 2 \times 10^5

T consists of P, D, and ?.

Input

Input is given from Standard Input in the following format:

T

Output

Print one string with the maximum possible doctoral and postdoctoral quotient among the strings that can be obtained by replacing each ? in T with P or D.
If there are multiple such strings, you may print any of them.

Sample Input 1

PD?D??P

Sample Output 1

PDPDPDP

This string contains three occurrences of D and three occurrences of PD as contiguous substrings, so its doctoral and postdoctoral quotient is 6, which is the maximum doctoral and postdoctoral quotient of a string obtained by replacing each ? in T with P or D.

Sample Input 2

P?P?

Sample Output 2

PDPD

Solution in PHP (7.4.4) (judge verdict: Wrong Answer)

<?php 
$t = trim(fgets(STDIN));
$count =strlen($t);
for ($i=0; $i < $count ; $i++) {
  // code...
  $str = substr($t,$i,1);
  if ($str == "?") {
    // code...
    if (substr($t, $i+1, 1) == 'D') {
      // code...
      $t = substr_replace($t, "P", $i,1);
    }elseif(substr($t, $i+1, 1) == '?') {
      // code...
      $t = substr_replace($t, "P", $i,1);
    }else{
       $t = substr_replace($t, "D", $i,1);
    }
  }
}
echo $t;