def jiemi(plainstr,keystr):
    if len(plainstr) % 2 == 0:
        p = int(round(len(plainstr) / 2.0))
        text = plainstr[:p][::-1]
        text2 = plainstr[p:][::-1]
        plainstr = text + text2
    k = 0
    text5 = ''
    for i in plainstr:
        text3 = i
        text4 = keystr[k]
        
        if ord(text3) ^ ord(text4) < 32 or \
           ord(text3) ^ ord(text4) > 126 or \
           ord(text3) < 0 or \
           ord(text3) > 255:
            text5 += text3
            print '%d'%k,text3
        else:
            text5 += chr(ord(text3) ^ ord(text4))
            print '%delse'%k,text3,text4,chr(ord(text3) ^ ord(text4))
        k+=1
        if k == len(keystr):
            k = 0
        
    return text5
if __name__ == '__main__':
    
    b = jiemi('SOT65^DQ1', 'jwc01')
    print b