Shorter substitute formula in excel

hi guys,

how can i shorter this formula?
it's working fine, but it seems too big, or is this okay to keep it as it is?
please advise.

=SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(UPPER(I7)," ","99"),"A","11"),"B","12"),"C","13"),"D","14"),"E","15"),"F","16"),"G","17"),"H","18"),"I","19"),"J","20"),"K","21"),"L","22"),"M","23"),"N","24"),"O","25"),"P","26"),"Q","27"),"R","28"),"S","29"),"T","30"),"U","31"),"V","32"),"W","33"),"X","34"),"Y","35"),"Z","36")

Please attach the excel file so that I can understand it more clearly

Originally Posted by azumi

Please attach the excel file so that I can understand it more clearly

Here enclosed