t.py

#!/usr/local/bin/python2.7
#coding:utf-8

d = open('c.in','r').read()
d = d.split(',')
f1 = d[::3]
f2 = d[1::3]
f3 = d[2::3]

k = range(32, 123)
def calc(c):
    r = []
    for j in range(97, 123):
        p = int(c) ^ j
        if p not in k:
            continue
        r.append(j)
    return set(r)

def m(f):
    r = None
    for i in range(len(f)):
        rc = calc(f[i])
        if not r:
            r = rc
            continue
        r = r & rc
    return r

print m(f1), m(f2), m(f3)