Formula Help

I need help with a formula to separate information.  Sometimes there will be a range of numbers that has a dash and sometimes there will not be a range.
My raw data looks like this:
91 - 99
305
305
82
95
93.3
93.2
89
90 - 94
95 - 97
87.7-89.2
88.6-89.5
83
95-97
88.5-89.5
88.5-89.2
92.7-93.3
87.1-88.3
92.3-93
91.7-92.2
91.5-91.6
91.4 - 93.2

I want it to look like this:

91        99
305      
305      
82      
95      
93.3      
93.2      
89      
90        94
95        97
87.7      89.2
88.6      89.5
83      
95      97
88.5      89.5
88.5      89.2
92.7      93.3
87.1      88.3
92.3      93
91.7      92.2
91.5      91.6
91.4        93.2


I know how to create a formula to find the "-"   =LEFT(A1,FIND("-",A1,1)-1)  or  =RIGHT(A1,LEN(A1)-FIND("-",A1)) but I don't know how to do the IF statement, etc. when there's not a dash.