#include<stdio.h>
void move(int n,char a,char b,char c){
if (n==1) {
printf("%c-->%c\n",a,c);
return;
}else{
move(n-1,a,c,b);
printf("%c-->%c\n",a,c );
move(n-1,b,a,c);
}
}
int main(int argc, char const *argv[]) {
int n;
scanf("%d",&n );
move(n,'a','b','c');
return 0;
}