#include<stdio.h>
#include <stdlib.h>
int main()
{
char str[100000];
scanf("%[^\n]",str);
int charcount[128]={0};
for(int i=0;str[i];i++)
{
charcount[str[i]]++;
}
for(int i=0;str[i];i++)
{
if(charcount[str[i]]==1)
{
printf("%c ",str[i]);
}
}
}
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