S=raw_input()
Slist=list(S)
Slist_ord=map(ord,Slist)
A=Slist_ord

for i in xrange(len(S)):
    A[i]=Slist_ord[i]-(i%26+1)
    if A[i]<65:
        A[i]+=26
Ans=map(chr,A)
print ''.join(Ans)