#include <iostream>
#include <string>
#include <algorithm>
 
int main() {
    std::string s { "1234567890" };
    std::fill(begin(s), end(s), 'A');
    std::cout << s << std::endl;
    std::fill_n(begin(s), 5, '1');
    std::cout << s << std::endl;
}