Filter table on first character being a letter

[cDS03900]

I have a table with all articles in it. Due to historical reason parts start with a letter, consumables with a digit. 

I now want too filter for further calculations with a button all parts, so articles starting with a letter out of this table.

I have for the moment no clue how to do this, in Excel I would simply write "> a"

[Taoufiq_Zarra]

can you share a sample Data with the expected output ?

[cDS03900]

I added a screenshot of a sample table how it looks and how it would need to look after filtering.

[Taoufiq_Zarra · Accepted solution]

OK

Data:
LOAD * INLINE [
    Article, Qty
    A0001, 1
    A0002, 2
    C3333, 4
    44444, 5
    Z0002, 6
    D22255, 7
    12345, 8
]where IsText(left(Article,1));

add where IsText(left(Article,1))

output :

[Saravanan_Desingh]

One more solution.

tab1:
LOAD * INLINE [
    Article, Qty
    A0001, 1
    A0002, 2
    C3333, 4
    44444, 5
    Z0002, 6
    D22255, 7
    12345, 8
]
Where Not IsNum(Left(Article,1));

[Saravanan_Desingh]

One more version.

tab1:
LOAD * INLINE [
    Article, Qty
    A0001, 1
    A0002, 2
    C3333, 4
    44444, 5
    Z0002, 6
    D22255, 7
    12345, 8
]
Where Lower(Left(Article,1))<>Upper(Left(Article,1));