# your code goes here
def rn(St):
    if St=="A":
        return 1
    elif St=="B":
        return 2
    elif St=="C":
        return 3
    elif St=="D":
        return 4
    elif St=="E":
        return 5
    elif St=="F":
        return 6
    elif St=="G":
        return 7
    elif St=="H":
        return 8
    if St=="I":
        return 9
    elif St=="J":
        return 10
    elif St=="K":
        return 11
    elif St=="L":
        return 12
    elif St=="M":
        return 13
    elif St=="N":
        return 14
    elif St=="O":
        return 15
    elif St=="P":
        return 16
    elif St=="Q":
        return 17
    elif St=="R":
        return 18
    elif St=="S":
        return 19
    if St=="T":
        return 20
    elif St=="U":
        return 21
    elif St=="V":
        return 22
    elif St=="W":
        return 23
    elif St=="X":
        return 24
    elif St=="Y":
        return 25
    elif St=="Z":
        return 26
def nr(n):
    if n==1:
        return "A"
    elif n==2:
        return "B"
    elif n==3:
        return "C"
    elif n==4:
        return "D"
    elif n==5:
        return "E"
    elif n==6:
        return "F"
    elif n==7:
        return "G"
    elif n==8:
        return "H"
    elif n==9:
        return "I"
    elif n==10:
        return "J"
    elif n==11:
        return "K"
    elif n==12:
        return "L"
    elif n==13:
        return "M"
    elif n==14:
        return "N"
    elif n==15:
        return "O"
    elif n==16:
        return "P"
    elif n==17:
        return "Q"
    elif n==18:
        return "R"
    elif n==19:
        return "S"
    elif n==20:
        return "T"
    elif n==21:
        return "U"
    elif n==22:
        return "V"
    elif n==23:
        return "W"
    elif n==24:
        return "X"
    elif n==25:
        return "Y"
    elif n==26:
        return "Z"
S=input()
T=""
for i in range(len(S)):
    a=i%26
#    print(i)
    n=rn(S[i])-a-1
 #   print(n)
    if n<1:
        n+=26
    T+=nr(n)
print (T)