#!/usr/bin/env python3

digit_map = {
    'zero': 0,
    'one': 1,
    'two': 2,
    'three': 3,
    'four': 4,
    'five':  5,
    'six': 6,
    'seven': 7,
    'eight': 8,
    'nine': 9
}

def find_digit_name(line):
    for digit_name in digit_map.keys():
        if line.startswith(digit_name):
            return digit_map[digit_name]
    return None

def find_digit(line, check_range):
    for i in check_range:
        if line[i].isdigit():
            return int(line[i])
        if (digit := find_digit_name(line[i:])) is not None:
            return digit
        

# read input file
with open('input', 'r') as f:
    lines = f.readlines()
    lines_sum = 0
    for line in lines:
        first_digit = find_digit(line, range(len(line)))
        last_digit = find_digit(line, range(len(line) - 1, -1, -1))
        num = str(first_digit) + str(last_digit)
        lines_sum += int(num)

print(lines_sum)