[02_StrList_07] 02-StrLst_★★★_Decryption.py

z=input()
a=str(z)
x=a[3::7]
y=a[7::5]
b=int(x)
c=int(y)
d=b+c+10000
e=(d%10000)//10 #4
f=e//100
g=(e%100)//10
h=e%10
t=str(f)
u=str(g)
v=str(h)
i=f+g+h
j=(i%10)+1 #5
k=['','A','B','C','D','E','F','G','H','I','J']
l=k[j] #6
print(t+u+v+str(l))