def to_hour(num) -> str:
to_str = str(int(num))<EOL>return pd.Timestamp(f'<STR_LIT>').strftime('<STR_LIT>')<EOL>
Convert YAML input to hours

Args:
    num: number in YMAL file, e.g., 900, 1700, etc.

Returns:
    str

Examples:
    >>> to_hour(900)
    '09:00'
    >>> to_hour(1700)
    '17:00'