a +b adder

#include<iostream>
#include<algorithm>
#include<string>
using namespace std;

int main()
{
	string str1, str2;
	while (cin >> str1 &&cin >> str2)
	{
		int length1 = str1.size();
		int length2 = str2.size();
		int min_length = length1 < length2 ? length1 : length2;
		string str3;
		int cnt = 0;
		reverse(str1.begin(), str1.end());
		reverse(str2.begin(), str2.end());
		for (int i = 0;i < min_length;++i)
		{
			int a = str1[i] - '0' + str2[i] - '0' + cnt;
			char c = a % 10 + 48;
			str3 += c;
			cnt = a / 10;
		}
		if (length1 < length2)
		{
			for (int j = min_length;j < length2;++j)
			{
				int a = str2[j] - '0' + cnt;
				char c = a % 10 + 48;
				str3 += c;
				cnt = a / 10;
			}
		}
		else
		{
			for (int j = min_length;j < length1;++j)
			{
				int a = str1[j] - '0' + cnt;
				char c = a % 10 + 48;
				str3 += c;
				cnt = a / 10;
			}
		}
		if (cnt == 1)
			str3 += '1';
		for (auto ix = str3.crbegin();ix != str3.crend();++ix)
			cout << *ix;
		cout << endl;
	}

	return 0;
}

//a + b累加器, a 和 b位数不超过1000位