#include <iostream>

using namespace std;

static char _c = 'c';
static char _w = 'w';

void Slove()
{
	char S[100001];
	cin >> S;

	int calc = 100000;

	int ans = 1;

	while (S[calc] != _c && S[calc] != _w)
	{
		calc = calc / 2;
	}
	
	if (calc != 1)
	{

		if (S[calc] == _c)
		{
			while (S[calc + calc / 2] == _c)
			{
				calc += calc / 2;
			}

			while (S[++calc] == _c);

			while (S[calc + 1 + ans++] == _w);

		}
		else
		{
			while (S[calc / 2] == _w)
			{
				calc /= 2;
			}

			while (S[--calc] == _w);

			ans = calc;
		}
	}

	cout << ans << endl;
}

int main()
{
	Slove();
}