#include<stdio.h>
int num[100000];
main(){
    int sum = 0;
    char c;
    int count = 0;//cの数
    while((c=getchar())!='\n' && c!=' '){
        if(c=='c'){
            num[count] = sum;
            count++;
        }
        if(c=='w'){
            sum++;
        }
    }
    long long ans = 0;
    for(int i = 0;i < count;i++){
        int a = sum-num[i];
        if(a >= 2){
            ans += a*(a-1)/2;
        }
    }
    printf("%lld\n",ans);
}