#include <cstdlib>
#include <fstream>

void Kappa(int n, char inName[], char outName[]){

    std::fstream in;
    in.open(inName, std::fstream::in);
    std::fstream out;
    out.open(outName, std::fstream::out);

    in.seekg(0, in.end);
    int len = in.tellg();
    char c;

    while (n-- && len--)
    {
        in.seekg(len, in.beg);
        c = in.get();

        if(std::isdigit(c)){
            c = '0' + ('9' - c);
        }

        out << c;
    }

    in.close();
    out.close();

}

int main(int argc, char* argv[]){

    int x;

    x = strtol(argv[1], NULL, 10);

    Kappa(x, argv[2], argv[3]);

return 0;
}