Numbers and text together in column

Dear all,

Could someone please help me to remove the texts, punctuation marks, i.e; hyphen's, slashes, colon etc from a particular column and get me only the numbers?

I'm an accountant by profession. If i could do this task in a jiff, i could have saved some time for other works as well.

Attached is the sample sheet for your kind reference.

Please help

The numbers that we see in Column C is very mandatory. These are the Receipt numbers and that's exactly what i need. I do not need these texts along with it....neither the punctuations..

Thanks
amey