w = list(input())

c_idx = [n for n, i in enumerate(w) if i == 'c']
w_idx = [n for n, i in enumerate(w) if i == 'w']

ls = []
for i in c_idx:
    if len([j for j in w_idx if j > i]) < 2:
        break
    else:
        ls = [j for j in w_idx if j > i]
        ls.append(ls[1] - i + 1)
                  
print(min(ls))