Comparing information in two columns

[bwise]

Hello to the forum. I have what seemed like an easy problem, but have been unable to find the solution. I have two columns of g/l account numbers on the attached spreadsheet. I am trying to compare the two columns to find out if every item in column a exists in column c. I'm not sure which function to use to accomplish this. Could someone take a look at this and help me out? Thanks in advance