文件目录

#include <iostream>
using namespace std;
void hnt(int n, char a, char b, char c)
{
    if (n == 1)
        printf("%c->%d->%c\n", a, n, b);
    else
    {
        hnt(n - 1, a, c, b);
        printf("%c->%d->%c\n", a, n, b);
        hnt(n - 1, c, b, a);
    }
}
int main()
{
    int n;
    char a, b, c;
    cin >> n >> a >> b >> c;
    hnt(n, a, b, c);
    return 0;
}