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#include <cstdio>
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int main()
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{
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long long p,d,ans,t=10;
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scanf("%lld%lld",&p,&d);
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ans=++p;
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for(;;)
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{
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if(p%t>d)
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break;
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ans=p-p%t;
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t=t*10;
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}
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printf("%lld",ans-1);
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return 0;
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}
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