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subtr returning incorrect value

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Last Modified: 2018-02-02
hi am in oracle 11gR2
when i did  SELECT SUBSTR('6210 - 14 - 242 - 8258', 10, 4) FROM DUAL; am geting -2
 
where emp = substr(emid,1,4))
and empcode= substr(emid,5,2))
and empsr=substr(emid,7,4));

select cii.sin from im_item_bii bii, im_item_cii cii where nsc = '6210' and ncb = '14' and item_no = '2428258' and cii.sin = bii.sin

i what value to separated like this
6210
14
2428258
 
am in 11g
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