get only number from string and find sum in crystal report formula

hello everyone
i want one help from you that  

example   : i have one database field  it contain some value like  

1)   abc-100,abc2-110,defa-200,xyzx-10  
2)   abcd-100,abc1-110
3)   xyza-10,zzz1-150
4)   pqrs-50,
5)   pppzab-150,pabc-150


i want answer like
1)420
2)210
3)160
4)50
5)300

i hope u all are understand and help me to solve that problem in crystal report
please help me friends  i am new for crystal report so please  
thanks


thanks
and regards smit