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

int main(void)
{
    int i, j, l;
    long long sum = 0, wc = 0;
    char s[100001];
    scanf("%s", &s);
	l = (int)strlen(s);

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

    return 0;
}