Synsort for subtotal

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Anonymous (not verified)
Synsort for subtotal

I am looking for a sort job that can do subtotal for me.

Sample input file

A 100
A 200
A 300
B 100
A 200
B 500

Sample output file

A 800
B 600
 
I think this can be achieved by using syncsort SUM function, can someone share me an example for doing the subtotal using syncsort.
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