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() {
	string s;
	cin >> s;
	int len = s.size();
	char a = s[0];
	char b;
	for (int i = 1; i < len; i++) {
		b = s[i];
		if (b != a) {
			cout << b;
			a = b;
		}
	}
	cin >> s;
	return 0;
}