#include <string>
#include <vector>
#include <algorithm>
#include <iostream>

using string = std::string;
using svector = std::vector<string>;

string prompts(const string&,bool*);
void sortVStringsAsc(svector &v);

int main() {
    svector inputs;
    bool s{true};
    while (s) {
        auto inp = prompts("Enter a string (Invalid to begin processing): ",&s);
        if (s) inputs.push_back(inp);
    }
    sortVStringsAsc(inputs);
    for (const auto &c : inputs) std::cout << c << "\n";
    return 0;
}

void sortVStringsAsc(svector &v) {
    sort(v.begin(), v.end(), [] (const string &x, const string &y) {return x.length() < y.length();});
}

double sumList(const std::vector<double> &l) {
    double sum = 0.0;
    for (const auto &c : l) sum += c;
    return sum;
}

class A {
    std::vector<string> s;
};

string prompts(const string &message, bool *success) {
    string tr{""};
    *success = false;
    std::cout << message;
    if (!(std::cin >> tr)) {
        std::cin.clear();
        std::cin.ignore();
        return "";
    }
    *success = true;
    return tr;
}