#include <iostream>

using string = std::string;
void ignoreTillLineEnd();
string promptfs(string);

int main()
{
    string name {promptfs("Enter your name:")};
    std::cout << "Hello " << name << "\n";
    return 0;
}

void ignoreTillLineEnd() {
    std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
}

string promptfs(string msg) {
    bool once {false};
    string toret {};
    do {
        if (once) {
            std::cin.clear();
            std::cout << "Input Failure!\n";
        }
        std::cout << msg << "\n";
        std::cin >> toret;
        ignoreTillLineEnd();
        once = true;
    }
    while (std::cin.fail());
    return toret;
}