View Code of Problem 3924

#include<iostream>


using namespace std;

int main(){
	string str;
	cin>>str;
	char c[200]={false};
	for(int i=0;i<str.length();++i){
		if(!c[str[i]]){
			cout<<str[i];
			c[str[i]]=true;
		}
	}
	
	return 0;
}