#include <iostream>
#include <cstdio>
#include <vector>

using namespace std;

const int base = 11;

class Integer {
    public:
        Integer() {}
        Integer(string str){
            int st = 0;
            sign = 1;
            if(str[0] == '-'){
                st = 1;
                sign = -1;
            }
            for(int i = str.size() - 1; i >= st; --i){
                digits.push_back(str[i] == 'a' ? 10 : str[i] - '0');
            }
        }

        friend Integer operator + (Integer a , Integer b){
            if(a.sign == 1 && b.sign == -1){
                return a - b.abs();
            }
            if(a.sign == -1 && b.sign == 1){
                return b - a.abs();
            }
            if(a.sign == -1 && b.sign == -1){
                Integer c = a.abs() + b.abs();
                return c.negate();
            }
            if(a.size() < b.size()){
                return b + a;
            }
            Integer c;
            int add = 0;
            int len = b.size();
            for(int i = 0; i < len; ++i){
                c.digits.push_back((a.digits[i] + b.digits[i] + add) % base);
                add = (a.digits[i] + b.digits[i] + add) / base;
            }
            for(int i = len; i < a.size(); ++i){
                c.digits.push_back((a.digits[i] + add) % base);
                add = (a.digits[i] + add) / base;
            }
            if(add){
                c.digits.push_back(add);
            }
            return c;
        }

        friend Integer operator - (Integer a , Integer b){
            if (a.sign != b.sign) {
                Integer c = a.abs() + b.abs();
                if (a.sign == -1) {
                    c.sign *= -1;
                }
                return c;
            }
            if (a.sign == -1) {
                Integer c = a.negate() - b.negate();
                c.sign *= -1;
                return c;
            }
            if (less(a, b)) {
                Integer c = b - a;
                c.sign = -1;
                return c;
            }
            //a >= b
            int len = max(a.size(), b.size());
            Integer c;
            c.digits.resize(len);
            for(int i = 0; i < len; ++i) {
                c.digits[i] = a.digits[i] - (i < b.size() ? b.digits[i] : 0);
                if (c.digits[i] < 0) {
                    c.digits[i] += base;
                    a.digits[i + 1]--;
                }
            }
            while(c.size() > 1 && c.digits.back() == 0) {
                c.digits.pop_back();
            }
            return c;
        }
        friend istream& operator >> (istream &is, Integer &a) {
            string str;
            is >> str;
            a = Integer(str);
            return is;
        }
        friend ostream& operator << (ostream &os, Integer a) {
            if (a.sign == -1) {
                os << '-';
            }
            for(int i = a.size() - 1; i >= 0; --i) {
                if (a.digits[i] == 10) {
                    os << 'A';
                } else {
                    os << a.digits[i];
                }
            }
            return os;
        }
    private:
        static bool less(Integer a, Integer b) {
            //returns true if a < b (a >= 0 && b >= 0)
            if (a.size() < b.size()) {
                return true;
            }
            if (a.size() > b.size()) {
                return false;
            }
            for (int i = 0; i < a.size(); ++i) {
                if (a.digits[i] != b.digits[i]) {
                    return a.digits[i] < b.digits[i];
                }
            }
            return false;
        }
        Integer abs(){
            Integer cur = *this;
            cur.sign = 1;
            return cur;
        }
        Integer negate() {
            Integer cur = *this;
            cur.sign *= -1;
            return cur;
        }
        int size() {
            return digits.size();
        }
        int sign;
        vector < int > digits;
};


int main() {

    freopen("in.rtf" , "r" , stdin);
    freopen("out.rtf" , "w" , stdout);

    Integer x, y;
    cin >> x >> y;

    return 0;
}