SIAOD3.1

#include <bits/stdc++.h>

using namespace std;

vector<string> check_substr(vector<string>& words, string substr){
    vector<string> matched;
    for(string & word : words){
        if(word.size() >= substr.size()) {
            bool unmatched = false;
            for (int j = 0; j < substr.size(); ++j) {
                if(substr[j] != word[j]) {
                    unmatched = true;
                    break;
                }
            }
            if(!unmatched)
                matched.push_back(word);
        }
    }
    return matched;
}

vector<string> separate_words(const string & text, const string & delimeters){
    vector<string> words;
    string temp_s = "";
    for(char i : text){
        if(find(delimeters.begin(), delimeters.end(), i) == delimeters.end()){
            temp_s += i;
        }
        else{
            words.push_back(temp_s);
            temp_s = "";
        }
    }
    words.push_back(temp_s);
    return words;
}

int main() {
    string substr = "", s = "";
    cin >> substr >> s;
    vector<string> words = separate_words(s, " ,.;!?:/");
    vector<string> matched = check_substr(words, substr);
    for(string i : matched){
        cout << i << '\n';
    }
    return 0;
}