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- var
- s1,s2,i : longint;
- begin
- readln(s1);
- readln(s2);
- for i:=1 to s2 do
- if s1 mod 10 = 0 then
- s1:=s1 div 10
- else
- s1:=s1-1;
- writeln(s1);
- end.
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