#!/usr/bin/env python

import re

def main():
    with open("text.in", "r") as file_in:
        words = re.findall(r"([a-zA-Z]+)", file_in.read())
        with open("text.out", "w") as file_out:
            lungime_medie = len(''.join(words)) // len(words)
            file_out.write(str(lungime_medie))
    exit(0)

if __name__ == "__main__":
    main()