Locate String in Array

ex: ARR<1,1>="A"
ARR<2,1>="B"
ARR<3,1>="C"
ARR<1,2>="1"
ARR<2,2>="2"
ARR<3,2>="3"
LOCATE "A" IN ARR<?,?> SETTING index THEN
result=ARR<index,2>
END
what values should i put in the ? mark? result should be "1"

thank you. I haven't tried your solution yet. But i found another solution for this issue. I still use locate, but I store the data to another dynamic array, and it works really well.