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 Python (3.8.2) (judge verdict: Wrong Answer)

table=list(input())
#print(table)
for i in range(len(table)-1):
    #print(table[i])
    if table[i]=="?":
        if table[i-1]=="P":
            print("D",end="")
            table[i]="D"
        
        elif table[i-1]=="D":
            print("P",end="")
            table[i]="P"

        elif table[i-1]=="P":
            print("D",end="")
            table[i]="D"

        #elif table[i-1]=="D":
        #    print("P",end="")
        #    table[i]="D"

        #elif table[i+1]=="?" :
        #    print("P",end="")
        #    table[i]="P"

    else:
        print(table[i],end="")
if table[-1]=="?":
    print("D",end="")
    


        
else:
    print(table[-1],end="")

print("")