package main

import (
	"bufio"
	"fmt"
	"log"
	"os"
	"unicode"
)

func main() {
	f, err := os.Open("input.txt")
	if err != nil {
		log.Fatal(err)
	}
	defer f.Close()

	sum := 0
	scanner := bufio.NewScanner(f)
	for scanner.Scan() {
		line := scanner.Text()
		first := -1
		last := -1
		for _, c := range line {
			if unicode.IsNumber(c) {
				n := int(c - '0')
				if first == -1 {
					first = n
					last = n
				} else {
					last = n
				}
			}
		}
		sum += 10*first + last
	}
	fmt.Println(sum)

	if err := scanner.Err(); err != nil {
		log.Fatal(err)
	}
}