#include<stdio.h>
int main(){
    int n;
    scanf("%d",&n);
    if(n < 0){
        printf("Invalid input");
        
    }
    else{
        scanf("%d %d", &n &n);
        printf("0 -> 1 -> 4");
        printf("0 -> 3 -> 4");
    
    }
    return 0;
}