#include <stdio.h>

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