import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class N436
{
	static int ans=0;
	static int cnt=0;
	public static void main(String[] args)throws IOException
	{
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		String str=br.readLine();
		int c=0,w=0;
		int[] h=new int[str.length()];
		for(int i=0;i<str.length();i++)
		{
			h[i]=0;
		}
		for(int i=0;i<str.length();i++)
		{
			String now=str.substring(i, i+1);
			if(now.equals("c"))
			{
				c++;
			}
			else if(now.equals("w")&&c>=2)
			{
				h[i-2]++;h[i-1]++;h[i]++;
				c=0;
				cnt++;
			}
			else
			{
				c=0;
			}
		}

		search(h,0,str.length()-1);

		System.out.println(ans);

	}

	static void search(int[] h,int st,int las)
	{
		int sbuf=0;
		int lbuf=0;

		if(cnt>0)
		{
			while(h[st]!=1)
			{
				st++;
				sbuf++;
			}sbuf++;//このbufが初めの１を消すまでの工程数


			while(h[las]!=1)
			{
				las--;
				lbuf++;
			}lbuf++;

			cnt--;

			if(sbuf<=lbuf)
			{
				h[st]=0;h[st+1]=0;h[st+2]=0;
				ans+=sbuf;
				search(h,st+1,las);
			}
			else
			{
				h[las]=0;h[las-1]=0;h[las-2]=0;
				ans+=lbuf;
				search(h,st,las-1);
			}


		}
		else
		{
			return;
		}


	}




}