Compare Two columns

Hello,

I tried to figure this out, seems to me that I'm getting close

I need the formula to look at column AA see if it says O or U, then look at
Column AB and see if it says O or U, then if they both meet this criteria,
then return 1 in AC,

this is what I have so far,

=IF(OR(AA26={"O","U"},AB26={"O","U"}),"1",""), I'm probably off, but it
seems to have started to do something. I was using the And function, but
running out of time.

Regards, thanks to all in advance.