line to word

#include<stdio.h>
#include<string.h>

int main()

{
    char s[1002],word[100];
    int i,j,length,is_word_started;
    gets(s);
    length = strlen(s);
    is_word_started = 0;
    for(i = 0,j = 0;i < length;i++)
    {
        if(s[i] >= 'a' && s[i] <= 'z')
        {
            if(is_word_started == 0)
            {
                is_word_started = 1;
                word[j] = 'A' + (s[i] - 'a');
                j++;
            }
            else
            {
                word[j] = s[i];
                j++;
            }
        }
       else if(s[i] >= 'A' && s[i] <= 'Z')
        {
            if(is_word_started == 0)
            {
                is_word_started = 1;
                j++;
            }
            else
            {
                word[j] = 'a' + (s[i] - 'A');
                j++;
            }
        }
        else if(s[i] >= '0' && s[i] <= '9')
        {
            if(is_word_started == 0)
            {
                is_word_started = 1;
                word[j] = s[i];
                j++;
            }
            else
            {
                word[j] = s[i];
                j++;
            }
        }

        else if(is_word_started == 1)
        {
            is_word_started = 0;
            word[j] = '\0';
            printf("%s\n",word);
            j = 0;
        }

    }
    return 0;

}