st1="Flow91"
st2="gun"
I=0
while I<len(st1):
   if st1[I]>="a" and st1[I]<="z":
      st2=st2+st1[I+1]
   elif st1[I]>="0" and st1[I]<="9":
      st2=st2+st1[I-1]
   else:
      st2=st2+"?"
   I=I+1
print(st2)