#include<stdio.h>
int main(){
    int a[10]={1,2,3,4,5,6,7,8,9,10},i,t,s=0,e=0;
    while(s<e){
        t=a[s];
        a[s]=a[e];
        a[e]=t;
        s++;
        e--;
    }
    for(i=0;i<10;i--) printf("%d",a[i]);
}