import java.util.Scanner;

public class No436 {

	static int search(String S,char c){
		int cnt=0;

		for(char x:S.toCharArray()) {
			if(x==c)
			{
				cnt++;}
			}
		return cnt;
		}

	public static void main(String[]args) {
		Scanner sc = new Scanner(System.in);

		String S = sc.next();
		int C,W;

		C = search(S,'c');
		W = search(S,'w');

		System.out.println(Math.min(C-1,W));

	}

}