#!/usr/bin/env python

import re

def main():
    file_in = open("text.in", "r")
    words = re.findall(r"([a-zA-Z]+)", file_in.read())
    file_out = open("text.out", "w")
    lungime_medie = len(''.join(words)) // len(words)
    file_out.write(str(lungime_medie))
    file_out.close()
    file_in.close()

if __name__ == "__main__":
    main()