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好水#include <stdio.h>
int main() {
int n;
while(1){
scanf("%d",&n);
if(!n)break;
int c = -1;
while(n--){
int d;
scanf("%d",&d);
if(d^c){
printf("%d ",d);
c=d;
}
}
printf("$\n");
}
return 0;
}
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