import java.util.*;

public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		char[] arr = sc.next().toCharArray();
		int cCount = 0;
		int wCount = 0;
		for (int i = 0; i < arr.length; i++) {
		    if (arr[i] == 'c') {
		        cCount++;
		    } else {
		        wCount++;
		    }
		}
		int ans = Math.min(cCount - 1, wCount);
		System.out.println(ans);
	}
}