#include<stdio.h>
int main()
{
    int n,rev,rem,original;
    scanf("%d",&n);
    if(n<=0)
    {
        ("Invalid input");
        return 0;
    }
    original==n;
    while(n>0)
    {
        rem=n/10;
        rev=rev*10+rem;
        n=n%10;
    }
    printf("%d",rev);
    return 0;
}