#include<stdio.h>
void printEvenNumbers(int current, int n){
    if(current > n){
        return;
    }
    if(current % 2== 0){
        printf("%d", current);
    }
    printEvenNumbers(current + 1, n);
}
void printOddNumbers(int currennt, int n){
    if(current % 2 != 0){
        printf("%d", current);
    }
    printOddNumbers(current + 1,n);
}
int main(){
    int n;
    scanf("%d", &n);
    if(n < 1){
        printf("Invalid input\n");
    } else {
        printEvenNumbers(1, n);
        printf("\n");
        printOddNumbers(1, n);
    }
    return 0;
}