#include <iostream> using namespace std;

void output(int n,char a,char b,char c) { if(n == 1){ cout << a << "->" << n << "->" << b << endl; return; } else{ output(n - 1,a,c,b); cout << a << "->" << n << "->" << b << endl; output(n - 1,c,b,a); } }

int main() { int n; char a,b,c; cin >> n >> a >> b >> c; output(n,a,b,c); return 0; }