#include <stdio.h>
#define MAXLINE 1000

void reverse(char s[]);
int mystrlen(char s[]);
int get_line(char s[], int maxline);

/* reverses input line by line */
int main()
{
    int end = 0;
    char line[MAXLINE + 1];

    while (end != EOF) {
        end = get_line(line, MAXLINE);
        reverse(line);
        printf("%s", line);
        if (end != EOF)
            putchar(end);
    }
}

/* reverses string 's' in place */
void reverse(char s[])
{
    char c;
    int i, len = mystrlen(s);

    for (i = 0; i < len / 2; ++i) {
        c = s[i];
        s[i] = s[len-i-1];
        s[len-i-1] = c;
    }
}

/* returns length of string 's' */
int mystrlen(char s[])
{
    int len;
    for (len = 0; s[len] != '\0'; ++len)
        ;
    return len;
}

/* reads (possibly truncated) line from input to s, returns \n or EOF */
int get_line(char s[], int maxline)
{
    int c, i;

    for (i=0; (c=getchar()) != EOF && c != '\n'; ++i) {
        if (i < maxline)
            s[i] = c;
    }

    if (i < maxline)
        s[i] = '\0';
    else
        s[maxline] = '\0';

    return c;
}