s = input()

num = {}
al = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
for i,c in enumerate(al):
  num[c] = i
res = []
for i,c in enumerate(s):
  m = num[c] - i - 1
  if m >= 0:
    res.append(al[m % len(al)])
  else:
    res.append(al[-(abs(m) % len(al))])
print(''.join(res))