07. The Noise and the Signal

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

using namespace std;

int main() {
    string str;
    getline(cin, str);

    istringstream ss(str);

    vector<string> noises;

    while (ss >> str) {
        string noise;

        for (char c : str) {
            if (!isdigit(c)) {
                noise += c;
            }
        }

        if (noises.size() > 0) {
            if (noises.front().length() > noise.length()) {
                continue;
            }
            else if (noises.front().length() < noise.length()) {
                noises = {};
            }
        }
        noises.push_back(noise);
    }

    sort(noises.begin(), noises.end());

    cout << (noises.front() != "" ? noises.front() : "no noise") << endl;

    return 0;
}