[R] create new rows with 0, if nessecary

[Mat]

hello togehter, 

i have a little problem, i have frames like this two:
      Cat      Hours      
A    101     15
B    103     10

      Cat      Hours      
A    103     16
B    106     11

I need to convert this 2 data.frames into the following equal structure:
      Cat      Hours
A    101
B    102
C    103
D    104
E    105
F    106

The 2 examples should be look this one:

      Cat      Hours
A    101      15
B    102       0
C    103      10
D    104       0
E    105       0
F    106       0

      Cat      Hours
A    101       0
B    102       0
C    103      16
D    104       0
E    105       0
F    106      11



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