text: text = input()
  code = input()
  
  
  main = [0] * len(text)
  for i in range(len(text)): 
      main[i] = [0] * 3
  
  print(main)
  j = 0
  for i in range(len(text)):
      main[i][0] = text[i]
      if j < (len(code)):
          main[i][1] = code[j]
          j += 1
      else:
          j = 0
          main[i][1] = code[0]
          j += 1
      
  print(main)
  
  
  
  for i in range(len(text)):
      num = 1071 + 1 + (ord(main[i][0])) - (ord(main[i][1]))
      if num > 1103:
          main[i][2] = chr(num - 32)
          print(num)
      elif num < 1072:
          main[i][2] = chr(num + 32)
      else:
          main[i][2] = chr(num)
          print(num)
  
  
  fin = ''
  for i in range(len(text)):
      fin = fin + main[i][2]
  print(fin)