#include <stdio.h>
#include <string.h>
int count=0;
void move(char a, char b)
{
printf("%c-->%c\n",a,b);
count++;
}
void hanoi(int n, char a, char b, char c)
{
if (n == 1)
{
move(a, c);
}
else
{
hanoi(n - 1, a, c, b);
move(a, c);
hanoi(n - 1, b, a, c);
}
}
int main()
{
int n=0;
scanf("%d", &n);
hanoi(n, 'a', 'b', 'c');
printf("count=%d\n", count);
return 0;
}
