f = open("intrare.in")
s = f.read()
f.close()

for sep in "-!?,.:;":
    s = s.replace(sep, " ")

g = open("text.out", "w")

s = s.split()
suma = 0
cnt = len(s)

for cuv in s:
    suma += len(cuv)

g.write(str(suma // cnt))
g.close()