#include <iostream>
#include <fstream>

template<typename Iter>
int search(Iter from, Iter to)
{
    while(from < to)
    {
        char c = *(from++);
        if (std::isdigit(c))
        {
            return c - '0';
        }
    }
    return 0;
}

int main(void)
{
    int answer{};

    std::ifstream input{ "./resources/input.txt" };
    if (input)
    {
        std::string line;
        while(not std::getline(input, line).eof())
        {
            answer += 10 * search(line.begin(), line.end());
            answer += search(line.rbegin(), line.rend());
        }

    }
    input.close();

    std::cout << answer << std::endl;
    return 0;
}