View Code of Problem 3924

#include<iostream>
#include<cstring>
#include<string>
#include<algorithm>
#include<vector>
#include<math.h>
#include<map>
#include<typeinfo>
using namespace std;

int main() {
	char a, b=' ';
	while (cin >> a) {
		if (a != b) {
			cout << a;
			b = a;
		}
	}
	return 0;
}