import sys


def input(): return sys.stdin.readline().rstrip('\n')


def main():
    w = 0
    a = 0
    for c in input()[::-1]:
        if c == 'w':
            w += 1
        if c == 'c':
            a += w*(w-1)//2

    print(a)


if __name__ == '__main__':
    main()