Sign In and Sign Out

def solve(m, data):
    m = int(m)
    records = str(data).strip().split(',')
    earliest_in = None
    earliest_name = ''
    latest_out = None
    latest_name = ''
    for rec in records[:m]:
        parts = rec.split()
        name, tin, tout = parts[0], parts[1], parts[2]
        if earliest_in is None or tin < earliest_in:
            earliest_in = tin
            earliest_name = name
        if latest_out is None or tout > latest_out:
            latest_out = tout
            latest_name = name
    print(f'{earliest_name} {latest_name}')