My Dog Sighs Mystery Cache

A simple puzzle cache- there is no need to go to the above coordinates, however there may be something there to help you concentrate your efforts. The cache is in a very busy location- so stealth will be required. 

You will need to find the values of A, B, C and D where:

A= Out of Gutter

B= Bristol Can

C= In rust we trust

D= Sand Sea Spray

and substitute the values into the following to find the cache coordinates:

N50 (B+D)(B+A).(Ax2)(A+B+C)(C+D) W001 0A.(B+C)(A+B)(Cx2)

***CONGRATULATIONS STARBUG24 ON FTF***