#include <iostream>
#include <string>
int main()
{
std::string str, str_long;
std::cin>>str_long;
while(std::cin>>str)
str_long = str_long + ' ' + str;
std::cout << str_long << std::endl;
return 0;
}
原文：http://blog.csdn.net/xumesang/article/details/45531801