题解 | #编码解码#

import sys

inttab = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
outtab = "BCDEFGHIJKLMNOPQRSTUVWXYZAbcdefghijklmnopqrstuvwxyza1234567890"
number = 1

for line in sys.stdin:
    s1  = ""
    s2  = ""
    a = line.strip()
    # print(int(a[0]) + int(a[1]))
    if number % 2 == 1:
        for i in a:
            if i in inttab:
                s1 += outtab[inttab.index(i)]
        print(s1)
    else:
        for i in a:
            if i in outtab:
                s2 += inttab[outtab.index(i)]
        print(s2)
    number = number + 1