#include<stdio.h>
int main()
{
    int n,u,v;
    scanf("%d %d %d"&n,&u,&v);
    if(-10<=n<0)
    {
        printf("invalid input");
    }
    else if(0<=n<=10)
    {
        printf(" ");
    }
    else
    {
        printf("");
    }
    return 0;
}