def letter_count(text: str) -> int:
    """
    Counts the number of letters (a-z and A-Z) in a given string.

    Parameters
    ------------
    text: str
        The text to count the letters of.

    Returns
    ------------
    int
        The number of letters in the given string.
    """
    count: int = 0
    for char in text:
        if(char.isalpha()):
            count+=1
    return count