import java.io.*;
import java.util.*;


public class Main_yukicoder436 {

	private static Scanner sc;
	private static Printer pr;

	private static void solve() {
		char[] s = sc.next().toCharArray();
		int n = s.length;

		if (n <= 2) {
			pr.println(0);
		} else {
			int cc = 0;
			int cw = 0;
			for (int i = 0; i < s.length; i++) {
				if (s[i] == 'c') {
					cc++;
				} else {
					cw++;
				}
			}

			if (cc < 2 || cw < 1) {
				pr.println(0);
			} else {
				pr.println(Math.min(cc - 1, cw));
			}
		}
	}

	// ---------------------------------------------------
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		pr = new Printer(System.out);

		solve();

		pr.close();
		sc.close();
	}

	private static class Printer extends PrintWriter {
		Printer(PrintStream out) {
			super(out);
		}
	}
}