#include <stdio.h>
#include<math.h>
int reverse(int n,int count)
{
    if(count==1)
    return n;
    else 
    return reverse(n/10,--count)+n%10*(int)pow(10,count);
}
int main(void)
{
    int n;
    scanf("%d",&n);
    int num=n;
    int count=0;
    while(num)
    {
        count++;
        num/=10;
    }
    printf("%d",reverse(n,count));
    return 0;
}