#include <stdio.h>
#include <string.h>

int main(void) {
    int w = 0;
    char s[100001];
    scanf("%s", &s);
	  
    int l = strlen(s);
    long long res = 0;

    for( int i = l - 1; i >= 0; i--) {
        if( s[i] == 'w' ) {
			w++;
        }
        else if( s[i] == 'c' ) {
          res += w * (w-1ll) /2 ;
			}
        }
    
    printf("%lld\n", res);

    return 0;
}