#include <iostream>#include <cstdio>#include <cstdlib>#include <cstring>using namespace std;#define maxn 105int f[maxn][2];int n;void work(){ int page_num = (n + 3) / 4; for (int i = 0; i < page_num * 2; i++) f[i][(i & 1) ^ 1] = i + 1; int j = page_num * 2 + 1; for (int i = page_num * 2 - 1; i >= 0; i--, j++) f[i][i & 1] = j;}void output(){ int page_num = (n + 3) / 4; for (int i = 0; i < page_num * 2; i++) { if (f[i][0] > n && f[i][1] > n) continue; printf("Sheet %d, ", i / 2 + 1); if (i & 1) printf("back :"); else printf("front:"); if (f[i][0] <= n) printf(" %d", f[i][0]); else printf(" Blank"); if (f[i][1] <= n) printf(", %d", f[i][1]); else printf(", Blank"); puts(""); }}int main(){ while (scanf("%d", &n), n) { printf("Printing order for %d pages:n", n); work(); output(); } return 0;}
