def sp(a,i):
if "a"<=a[i]<= "z" :
a=a[:i]+a[i+1:]
elif "0"<=a[i]<= "9":
a=a[:i]+str((int(a[i])+3)%10)+a[i+1:]
return a
s="cfi3H8qwz4";i=0
while i<len(s):
s=sp(s,i)
i+=1
执行上述程序段后,s的值为( )