s=19+13=32-26=6→g; y=25+13=38-26=12→l; t=20+13=33-26=7→g → "glg"
tnzyl → gma b o (g,m,a,b,o) syt → h b g jwlaqy → q d o z j b tnzyl-syt-jwlaqy
t (19) +13 = 32 → 32-26=6 → g n (13) +13 = 26 → 26-26=0 → a (but careful: a=1? Let's use a=0,b=1: t=19, +13=32%26=6→g; n=13,+13=26%26=0→a; z=25,+13=38%26=12→m; y=24,+13=37%26=11→l; l=11,+13=24→y) – let’s do systematically: tnzyl-syt-jwlaqy
obamg gbh bjzodq → no. Try ROT5 on group1: tnzyl → y s e d q? No. tnzyl-syt-jwlaqy
j=10+13=23→w; w=23+13=36-26=10→j; l=12+13=25→y; a=1+13=14→n; q=17+13=30-26=4→d; y=25+13=38-26=12→l → "wj yndl"
Better to run Atbash on each letter without changing order , ignoring hyphens: