mz07-1

#include <iostream>
#include <iomanip>

int
main(void)
{
    std::cout.unsetf(std::ios::dec);
    std::cout.setf(std::ios::hex);

    constexpr int MAX_CHAR = 4;

    int ch = std::cin.get();

    while (ch != EOF) {
        int old = ch;
        int count = 1;
        while (old == (ch = std::cin.get())) {
            ++count;
        }

        if (old == '#' or count > MAX_CHAR) {
            std::cout << '#' << char(old) << count << '#';
        } else {
            while (count-- > 0) {
                std::cout << char(old);
            }
        }
    }

    return 0;
}