#include <bits/stdc++.h>
using namespace std;

#define rep(i,x,y) for (int i=x;(x<=y?i<=y:i>=y);i=(x<=y?i+1:i-1))

int main() {
    rep(i,1,10) printf("%d ", i);
    puts("");
    rep(i,10,1) printf("%d ", i);
    puts("");
    return 0;
}