#!/usr/bin/env python3
import re

STRINGS = ["one", "two", "three", "four", "five", "six", "seven", "eight", "nine"]

lines = (x.strip() for x in open("input.txt"))
total = 0
regexFirst = re.compile(f"^.*?(\\d|{'|'.join(STRINGS)})")
regexLast = re.compile(f"^.*(\\d|{'|'.join(STRINGS)})")

def parse(value):
    return str(STRINGS.index(value) + 1) if value in STRINGS else value

for line in lines:
    first = parse(regexFirst.match(line).group(1))
    last = parse(regexLast.match(line).group(1))
    total += int(first + last)

print(total)