#include <iostream>
#include <string>

using namespace std;

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

void Slove()
{
	string S;
	cin >> S;

	int size = S.length();
	int calc = size / 2;

	int ans = 1;

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

		for (int i = calc; i < size; ++i)
		{
			if (S[i] == _w)
			{
				ans = size - i;
				break;
			}
		}
	}
	else
	{
		while (S[calc / 2] == _w)
		{
			calc /= 2;
		}

		for (int i = calc; i > 0; --i)
		{
			if (S[i] == _c)
			{
				ans = i;
				break;
			}
		}
	}

	cout << ans << endl;
}


int main()
{
	Slove();
}