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

const unsigned int NUM = 200;

int main(){
	std::vector<unsigned int> buf;
	std::string str;

	unsigned int a,b;

	for(int index = 0; index < NUM; index++){
		std::cin >> a >> b;
		if(std::cin.eof()) break;
//		sscanf(str.c_str(), "%d %d\n", &a, &b);
		std::cout << "sum : " << a + b << std::endl;
		buf.push_back(a + b);
	}

	for(auto&& sum : buf){
		std::cout << sum << std::endl;
	}
}