#include <stdio.h>

void print_inverse(char *string, int i)
{
    if (i == -1)
    {
        return;
    }
    printf("%c", string[i]);
    print_inverse(string, i - 1);
}

int read_string(char *string, int i)
{
    if (scanf("%c", &string[i]) == EOF)
    {
        printf("\n");
        return i;
    }
    printf("i = %d\n", i);
    read_string(string, i + 1);
}

void to_convert(char *string, int i, int j)
{
    if (j == i)
    {
        return;
    }
    string[0] -= '0';
    to_convert(string, i, j + 1);
}

int main()
{
    char string[255];

    int size = read_string(string, 0);
    printf("%d\n", size);
    to_convert(string, size, 0);
    print_inverse(string, size);
    return 0;
}