A+B

#include<bits/stdc++.h>
using namespace std;
#define boost ios_base::sync_with_stdio(0)
#define boost1 cin.tie(0)
#define boost2 cout.tie(0)
#define ll long long int
#define ull unsigned long long int
bool isSmaller(string str1, string str2)
{
    int n1 = str1.length(), n2 = str2.length();

    if (n1 < n2)
    return true;
    if (n2 < n1)
    return false;

    for (int i=0; i<n1; i++)
    if (str1[i] < str2[i])
        return true;
    else if (str1[i] > str2[i])
        return false;

    return false;
}

string findDiff(string str1, string str2)
{

    if (isSmaller(str1, str2))
        swap(str1, str2);

    string str = "";

    int n1 = str1.length(), n2 = str2.length();

    reverse(str1.begin(), str1.end());
    reverse(str2.begin(), str2.end());

    int carry = 0;

    for (int i=0; i<n2; i++)
    {

        int sub = ((str1[i]-'0')-(str2[i]-'0')-carry);

        if (sub < 0)
        {
            sub = sub + 10;
            carry = 1;
        }
        else
            carry = 0;

        str.push_back(sub + '0');
    }
    for (int i=n2; i<n1; i++)
    {
        int sub = ((str1[i]-'0') - carry);

        if (sub < 0)
        {
            sub = sub + 10;
            carry = 1;
        }
        else
            carry = 0;

        str.push_back(sub + '0');
    }

    reverse(str.begin(), str.end());

    return str;
}
string doSum(string a, string b)
{
    if(a.size() < b.size())
        swap(a, b);

    int j = a.size()-1;
    for(int i=b.size()-1; i>=0; i--, j--)
        a[j]+=(b[i]-'0');

    for(int i=a.size()-1; i>0; i--)
    {
        if(a[i] > '9')
        {
            int d = a[i]-'0';
            a[i-1] = ((a[i-1]-'0') + d/10) + '0';
            a[i] = (d%10)+'0';
        }
    }
    if(a[0] > '9')
    {
        string k;
        k+=a[0];
        a[0] = ((a[0]-'0')%10)+'0';
        k[0] = ((k[0]-'0')/10)+'0';
        a = k+a;
    }
    return a;
}

int main()
{
    boost;boost1;boost2;

    string s1,s2,s3,s4,st1,st2;
    cin>>s3;

    cin>>s4;

 st1=s3;
 st2=s4;
    if(s3[0]=='+' || s3[0]=='-')
    {
        s3=s3.erase(0,1);
    }
    else
    {
        s3=s3;
    }
    if(s4[0]=='+' || s4[0]=='-')
    {
        s4=s4.erase(0,1);
    }
    else
    {
        s4=s4;
    }

   ///  cout<<s3<<" "<<s4<<endl;
    if(isSmaller(s3,s4)==true)
    {
        s1=s4;
        s2=s3;
    }
    else
    {
        s1=s3;
        s2=s4;
    }
   /// cout<<s1<<" "<<s2<<endl;
    ///cout<<st1<<" "<<st2<<endl;
    if(st1[0]=='-'&& st2[0]!='-')
    {
        if(isSmaller(s4,s3)==true)
        {
            cout<<"-"<<findDiff(s1,s2)<<endl;
        }
        else
        {
            cout<<findDiff(s1,s2)<<endl;
        }
    }
      else if(st1[0]!='-'&& st2[0]=='-')
    {
        if(isSmaller(s3,s4)==true)
        {
            cout<<"-"<<findDiff(s1,s2)<<endl;
        }
        else
        {
            cout<<findDiff(s1,s2)<<endl;
        }
    }
    else
    {
        if(st1[0]=='-' && st2[0]=='-')
        {
            cout<<"-"<<doSum(s1,s2)<<endl;
        }
        else
        {
            cout<<doSum(s1,s2)<<endl;
        }
    }

return 0;
}