#include <fstream>
#include <stdio.h>
using namespace std;

bool is_letter (char c)
{
    return ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'));
}

bool is_b (char c)
{
    return (c >= 'A' && c <= 'Z');
}

bool is_s (char c)
{
    return (c >= 'a' && c <= 'z');
}

int main ()
{
    //freopen ("a.in", "r", stdin);
    //freopen ("a.out", "w", stdout);
    char c;
    bool f = true;
    bool g = true;
    int ans = 0;
    char s[10010];
    int i;
    while (gets(s) != 0)
    {
        for (i = 0; i < strlen(s); ++i)
        {
            c = s[i];
            //scanf ("%c", &c);
            if (c == '.' || c == '!' || c == '?')
            {
                f = true;
                g = true;
            }
            else
            {
                if (is_letter(c))
                {
                    if (is_b(c))
                    {
                        if (!g)
                        {
                            ++ans;
                        }
                    }
                    else if (is_s(c))
                    {
                        if (f)
                        {
                            ++ans;
                        }
                    }
                    f = false;
                    g = false;
                }
                else
                {
                    g = true;
                }
            }
        }
    }
    printf ("%d\n", ans);
    return 0;
}

Edited by author 28.09.2007 19:31

i think that in test where are not only ( ,.:;!?)+('A'..'Z')+('a'..'z')+(0..9) symbols...

Edited by author 05.11.2007 05:36

3th test has digits in word. If word contains digit - it's word, but in text write "A word is a sequence of letters(!!!) not containing any other symbols or ends of line". The digits is ignored and the is checked the first letter  after digits.

Try this test:
A
A
answer = 0

Hi,

How come the answer is 0 ? This means, there is only one word in the entire text and that is AA. There is one mistake because second A is capital.

Varun