from typing import List


def read_ta_list(fname: str)->List[str]:
    """ Read total list of TAs from a file with one TA roll number per line"""
    tfile = open(fname,"r")
    tas = []
    for l in tfile:
        s=l.strip()
        if (len(s)==0):
            continue
        tas.append(s.lower())
    return tas