lolkek4eburek

#include <iostream>
#include <string>
#include <sstream>

using namespace std;

string changeLetters(string word);

int main() {
    setlocale(LC_ALL, "Russian");

    string input = "МИНИМУМ СОСИСОК", words;

    stringstream ss;

    ss << input;

    while (ss >> words) {
        cout << changeLetters(words) << endl;
    }

    return 0;
}

string changeLetters(string word) {
    for (int i = 0; i < (int)word.length(); i++)
    {
        if (word[i] == word[0] && i != 0) {
            word[i] = '.';
        }
    }
    return word;
}