#include <stdio.h>
int main(void){
    int c=-1,w=0,p;
    while((p=getchar())!=EOF){
        scanf("%d",&p);
        if(p=='c'){
            c++;
        }else w++;
    }
    if(c<w){
        printf("%d",c);
    }else printf("%d",w);
    return 0;
}