7.1

//Щеглов В.А. 19ВИ1
#include <string>
#include <vector>
#include <iostream>
#include <sstream>
using namespace std;

int counter(string S, string S1)
{
    int count = 0;
    string::size_type position = 0;
    while ((position = S.find(S1, position)) != string::npos) {
        count++;
        position++;
    }
    return count;
};

int word_count(string strings)
{
    istringstream split(strings);
    vector<string> tokens;
    char split_char = ' ';
    for (string each; getline(split, each, split_char); tokens.push_back(each));

    int count = 0;

    for(auto& s: tokens) {
        if (counter(s, "А") == 3) {
            count += 1;
        };
    };
    return count;
}

int main()
{
    setlocale(LC_ALL, "Russian");
    cout << "Enter string s: ";
    string s;
    getline(cin, s);
    cout << "Completed string s: " << s << endl;
    cout << "Count of words with \"AAA\": " << word_count(s);
}