#include <iostream>
#include <vector>
#include <string>
#include <cstdint>
using namespace std;

static string trim(string const& s) {
    string ret = s;
    const bool negative = ret.front() == '-';
    const auto pos = ret.find_first_not_of("-0") - size_t(negative);
    if (pos != std::string::npos)
        ret.erase(size_t(negative), pos);
    return ret;
}

static std::string subtract([[maybe_unused]] std::string_view str1, [[maybe_unused]] std::string_view str2) {
    return "";
}

static std::string add(std::string_view str1, std::string_view str2) {          // returns arithmetic addition of str1+str2
    if (str1.size() == 0)
        return std::string{str2};
    else if (str2.size() == 0)
        return std::string{str1};

    const bool neg1 = str1.front() == '-';
    const bool neg2 = str2.front() == '-';

    if (neg1)
        str1.remove_prefix(1);
    if (neg2)
        str2.remove_prefix(1);

    if (neg1 && neg2) {
        return "-" + add(str1, str2);
    } else if(neg1) {
        return subtract(str2, str1);
    } else if(neg2) {
        return subtract(str1, str2);
    } else {
        size_t carry = 0;
        auto it1 = str1.crbegin();
        auto it2 = str2.crbegin();
        const auto end1 = str1.crend();
        const auto end2 = str2.crend();
        std::string sum;
        sum.reserve(std::max(str1.size(), str2.size()));
        for (; it1 < end1 || it2 < end2; ++it1, ++it2) {
            uint64_t val1 = it1 < end1 ? uint64_t(*it1) - 48 : 0;
            uint64_t val2 = it2 < end2 ? uint64_t(*it2) - 48 : 0;
            uint64_t track_sum = val1 + val2 + carry;
            carry = track_sum / 10;
            sum = std::to_string(track_sum % 10) + sum;
        }
        if (carry != 0) {
            sum = std::to_string(carry) + sum;
        }
        return trim(sum);
    }
}


/*
./build//a.out
-.0
0.0
-.0
1
-100000000000.0
./build//a.out
-0
00
-0
100000000000.0
-00000000000.0

./build//a.out
	12
-1.20
	11
1.20
	12
-1.20
	0
1
	1
-100000000000.0

*/


auto main() -> int {
//    std::cout << add("1", "1") << std::endl;
//    std::cout << add("-3141526", "-3141526") << std::endl;
//    std::cout << trim("-000000000001.20") << std::endl;
//    std::cout << trim("1000000000001.20") << std::endl;
//    std::cout << trim("-100000000000.0") << std::endl;
//    std::cout << trim("-") << std::endl;

    std::cout << "Hello, world!" << std::endl;

}