#include <iostream>
#include <stack>
#include <string>
#include <sstream>
 
using namespace std;
 
int main(int argc, const char * argv[])
{
        stringstream ss;
        stack<int> stack1, stack2, resultStack;
        string input;
 
        // Build stack 1
        cout << "Numbers: ";
        cin >> input;
 
        for (int i = 0; i != input.length(); ++i) {
                int temp = 0;
                ss << input[i];
                ss >> temp;
                stack1.push(temp);
        }
 
        // Build stack 2
        cout << "Numbers: ";
        cin >> input;
        for (int i = 0; i != input.length(); ++i) {
                int temp = 0;
                ss << input[i];
                ss >> temp;
                stack2.push(temp);
        }
 
 
 
        int carry=0, op1=0, op2=0;
        while (true) {
                op1=0,op2=0;
                if (stack1.empty() && stack2.empty()) break;
                if (!stack1.empty()) { op1 = stack1.top(); stack1.pop(); }
                if (!stack2.empty()) { op2 = stack2.top(); stack2.pop(); }
                int opTotal = 0;
                opTotal = op1 + op2 + carry;
                resultStack.push(opTotal%10);
                if (opTotal >= 10) carry = 1; else carry = 0;
        }
 
        cout << "\nResult is: ";
        while (!resultStack.empty()) {
                cout << resultStack.top();
                resultStack.pop();
        }
 
        cout <<"\n\n";return 0;
}
 

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