inp = input()
#inp = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'

ans = ''
for i in range(len(inp)):
    check = chr( ord(inp[i]) - ((i+1)%26) )
    while True:
      if(ord(check)<65):
        check=chr(ord(check)+26)
      elif(ord(check)>90):
        check=chr(ord(check)-26)
      else:break
    ans = ans + check
print(ans)