include <stdio.h>

include <string.h>

include<stdlib.h>

void reverse(char *str)
{
int len = strlen(str);
char tmp = *str;
*str = *(str+len-1);
*(str+len-1) = '\0';

if(strlen(str+1)>1)
    reverse(str+1);

*(str+len-1) = tmp;

}
int main()
{
char arr[100];
gets(arr);
reverse(arr);
printf("%s\n", arr);
return 0;
}