JavaScript Stop .replace from replacing a character multiple times in Javascript

I have a string which will look something like "R U R' U' R' F R2 U' R' U' R U R' F'"

I want to replace all of the R's with F's, and all of the F's with R's. The issue is that when I use multiple .replaces like shown below, the R's are changed to F's and then changed back to R's, resulting in no change.

alg = alg.replace(/R/g, "F").replace(/F/g, "R");
Answer:1

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