[실5] 1439 - 뒤집기

#include <iostream>
#include <string>

using namespace std;


int main()
{
	ios::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);

	string s; cin >> s;
	int res = 0;

	for (size_t i = 0; i < s.length(); i++)
	{
		if (s[i] != s[i + 1])
			res++;
	}
	cout << (res > 0 ? res / 2 : res);
}