#include <stdio.h>

int main(){
    char a[100001];
    int i=0, n;
    scanf("%s",a);
    if(a[0] == 'c' && a[1] == 'w' && a[2] == '\0'){
        printf("%d", 0);
        return 0;
    }
    
    while(a[i] == 'c') i++;
    n = i;
    while(a[i] != '\0') i++;
    if(n < i - n)
        if(n==0) printf("%d", 0);
        else printf("%d", n-1);
    else printf("%d", i-n);
    
    return 0;
}