# -*- coding: utf-8 -*-
"""
No.436 ccw
https://yukicoder.me/problems/no/436
"""
import sys
from sys import stdin
input = stdin.readline


def main(args):
    S = input().strip()
    c_count = S.count('c')
    w_count = S.count('w')
    ans = min(c_count - 1, w_count)
    print(ans)


if __name__ == '__main__':
    main(sys.argv[1:])