import re

FILE_NAME = "test"

MODE = "test"


def find_fitting(line):
    acronym_pattern = re.compile(r"^(?!\d)\w+$")

    if re.search(acronym_pattern, line):
        return "yes"
    else:
        return "no"


if MODE == "test":
    with open(FILE_NAME + ".in", "r", newline="", encoding="utf8") as file:
        text = [line.rstrip() for line in file.readlines()]

    with open(FILE_NAME + ".exp", "r", newline="", encoding="utf8") as file:
        expected = [line.rstrip() for line in file.readlines()]

    out: list[str] = []
    for line in text:
        out.append(find_fitting(line))

    for ind, found in enumerate(out):
        if found == expected[ind]:
            print(found)
        else:
            print("ERROR")

elif MODE == "input":
    line = input("Enter a line: ")

    # Check if the line is an acronym and print 'yes' or 'no'
    if find_fitting(line) == "yes":
        print("yes")
    else:
        print("no")