import re

def isMatch(rgx, s):
    return bool(re.compile(rgx).match(s))

def strconcat(ls):
    return "".join(ls)

def lines(s):
    return s.split("\n")

def unlines(ls):
    return "\n".join(map(str,ls))

def lines(s):
    return s.split("\n")

def split(sign, ls):
    rs = []
    curr = []
    for x in ls:
        if x==sign:
            rs.append(curr)
            curr = []
        else:
            curr.append(x)
    rs.append(curr)
    return rs