#!/usr/bin/python3

"""
Takes a list of maf filenames on the command line and prints a comma separated
list of the species that occur in all of the mafs.

usage %prog maf1 maf2 ...
"""
import operator
import sys
from functools import reduce

import bx.align.maf

files = sys.argv[1:]
sets = []

for file in files:
    sys.stderr.write(".")
    s = set()
    for block in bx.align.maf.Reader(open(file)):
        for comp in block.components:
            s.add(comp.src.split(".")[0])
    sets.append(s)

inter = reduce(operator.and_, sets)
print(",".join(inter))