# Python3
# AutoBase.py
from base64 import *
s = input()
lis1 = [s]
lis2 = []
lis3 = []
lis4 = []
while(1):
   for a in lis1:
     ok = 0
       try:
            lis2.append(b64decode(a).decode('ascii'))
            ok = 1
       except:
         pass
        try:
            lis2.append(b32decode(a).decode('ascii'))
            ok = 1
       except:
         pass
        try:
            lis2.append(b16decode(a).decode('ascii'))
            ok = 1
       except:
         pass
        if not ok:
         lis3.append(a)
   if not len(lis2):
      break
   lis1=lis2.copy()
 lis2.clear()
for a in range(0,len(lis3)):
    ok = 1
   for b in lis3[a]:
      if ord(b)>126 or ord(b)<32:
          ok = 0
           break
   if ok:
      lis4.append(lis3[a])
print(lis4)