Since the example is short, a likely plaintext could be: Shift :
Shift (a→f, etc.):
But note hynwk → shift back by 1 gave gxmvj — maybe it’s a name? Let’s try (equiv forward by 5): h=7-21=-14+26=12→m y=24-21=3→d n=13-21=-8+26=18→s w=22-21=1→b k=10-21=-11+26=15→p → mdsbp no. hynwk myny - -wnh 4
But I notice: hynwk → try shift forward by 11: h+11=18→s, y+11=35 mod26=9→j, n+11=24→y, w+11=33 mod26=7→h, k+11=21→v → sjy hv no. Since the example is short, a likely plaintext