# Keiss USACO

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#Started: 10:53
#Finished 1:54 AM (Gave up)
#Program only works for one operator :(

list = []
wordlist = []
#two lists: list is for compiling the characters and wordlist is the end product

z = input("input")
def split(word):
return [char for char in word]
char = split(z)
#split the formula into separate characters

def output():
word = ''.join(list)
wordlist.append(word)
#turns the characters back into words

#check and see if there are any special characters and return None if there arent
done = False
r = 0
#variable r (changes what is inputted)
o = 6
#limiting variable
#HOW DO I MAKE IT NOT DEPENDENT ON ONE VARIABLE????
while o >= r:
for n in range(len(char)):
#Run through from 0 to whatever
if char[n] == '?':
if r == 6:
list.remove(char[n-1])
#get rid of the preceding char
r += 6
#Add 6 to make sure that it only runs twice
done = True
elif char[n] == '*':
if r == 0:
list.remove(char[n-1])
else:
list.remove(char[n - 1])
list.extend(char[n-1]*round(r/2))
#extend multiplies the char (i would not use this if there was a better way)
r += 2
done = True

elif char[n] == "+":
list.extend(char[n - 1] * round(r / 3))
r += 3
done = True
else:
list.append(char[n])
#if not a special character, just append to list

if done == False:
print(None)
r+=2
#If none, kill loop and print None
else:
output()
#pull output and append to word. Clear the list afterward
list.clear()
print(wordlist)
#print final product