ls = list(input())

res = 0

try:
    print(ls)
    place_1 = ls.index('c') + 1
    place_2 = ls.index('w', place_1) + 1
    place_3 = ls.index('w', place_2) + 1
    print(str(place_3 - place_1 + 1))
except ValueError:
    print('-1')