#include <stdio.h>

#define MAXLINE 1000 /* maximum input line size */

int getaline(char line[], int maxline);

void reverse(char s[]);

/* Remove trailing blanks and tabs. Omit empty lines. */

main()

{

int len; /* current line length */

char line[MAXLINE]; /* current input line */

while ((len = getaline(line, MAXLINE)) > 0) {

line[len-1] = '\0'; // chop off the newline

reverse(line);

printf("%s\n", line);

}

return 0;

}

/* reverse: reverses string s */

void reverse(char s[])

{

int i, j;

char tmp;

/* find the end of the string */

for (j=0; s[j]!='\0'; ++j)

;

--j; // j points at the last char in the string

for (i=0; j>i; ++i) {

tmp = s[i];

s[i] = s[j];

s[j] = tmp;

--j;

}

}

/* getaline: read a line into s, return length */

int getaline(char s[], int lim)

{

int c, i;

for (i=0; i<lim-1 && (c=getchar())!=EOF && c!='\n'; ++i)

s[i] = c;

if (c == '\n') {

s[i] = c;

++i;

}

s[i] = '\0';

return i;

}