VBA Loop search specific values in a selected range

I am trying to make a small code which would search a provided range of numbers (which is selected with an input box) for codes from a 'dictionary'. All numbers are used as text, because dictionary numbers contain zeroes in front of them. I made small code based on the info I found on the net but it gives me an error 424 on of the lines of code (I will specify it in the code below)

Here is my workflow:

1. Press the button to select the range of cells where the matches from the dictionary will be searched
2. Convert the the selected range to Text
3. Loop search the values from dictionary in the input-box-selected range and highlight the cells with the match.
4. Press another button to reset formatting (to prepare the sheet for pasting another range).

    Sub SearchAndFormat_Click()
    Dim Dictionary As Variant
    Dictionary = Range("O1:O671").value 'the dictionary range whose values to be loop searched
            
    Dim r As Range 'input box to select the range where the dictionary values will be searched
    Set r = Application.InputBox("Select range", "Selection Window", Type:=0) '424 error
    r.NumberFormat = "@" 'set input box values format to Text to avoid problems
        
    Dim word As Variant
    For Each word In Dictionary
    r.Find(word).Interior.ColorIndex = 4 'if dictionary values are found in r, add red fill to the cell
    Next
    End Sub

And here is the code for the clear formatting button in the previously selected range:

Sub ClearFormat_Click()
    r.ClearFormats
End Sub

Looking forward to your support!