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{\bf Exercise:} [Indefinite iteration, reading, programming logic.] 
An input file contains a sequence of positive integer data in groups
separated by the sentinel~{\tt -1}, and terminated by the sentinel~{\tt -2}.
Your program should read the data, printing each on a separate line.
At each sentinel, print the subtotal for the group it follows. At the
terminating~{\tt -2}, also print the total of all the data. Naturally,
you don't print the sentinels or add them in.

Allow for the possibility that the number of data in a group may be zero,
and that the number of groups may be zero.
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\line{\copyright 1984 Robert W. Floyd; 
First draft (not published) March 15, 1984\hfil}
%revised: Date; subsequently revised.\hfill}

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