#include<iostream>
#include<string.h>
using namespace std;
void deDupe(char *a) {
int i=0, j=0;
int b[256]={0};
memset(b, 0, sizeof(b));
while(a[i]!='\0') {
if(b[a[i]]==0) {
b[a[i]]=1;
a[j++]=a[i++];
} else {
i++;
}
}
a[j]='\0';
return ;
}
int main() {
char a[100];
scanf("%s",a);
deDupe(a);
cout<<a<<endl;
return 0;
}
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