/*
 ** sent.c - count number of lines, words, characters & sentences from standard input.
 */

#include <stdio.h>

int
main( void )
{
    unsigned long  nl = 0UL;   /* #lines */
    unsigned long  nw = 0UL;   /* #words */
    unsigned long  nc = 0UL;   /* #chars */
    unsigned long  ns = 0UL;   /* #sentences*/

    int   c;
    int   inword = 0;         /* true only when inside a word */
    int   upper_case = 0;     /* true only when character read is an Upper-case letter*/
    int   period = 0;         /* true only when a '.' character is read*/
    int   outward = 0;
    while ( (c = getchar()) != EOF )
    {
        ++nc;

        if ( c == '\n' )
            {
                ++nl;
            }

        if ( c == ' ' || c  == '\n' || c == '\t'
            || c == '\r' || c == '\v' || c == '\f' )
            {
                /* if whitespace, we're not inside a word */
                inword = 0;

            }
        else if ( !inword )
            {
                inword = 1;
                ++nw;
            }

        if ( 'A' <= c  &&  c  <= 'Z' )
            {
                upper_case = 1;
            }
        else
            {
                upper_case = 0;
            }

        if ( c == '.' || c == '?' || c == '!' )
        {
            period = 1;
            }


        if ( c == ' ' || c  == '\n' || c == '\t'
            || c == '\r' || c == '\v' || c == '\f' )
        {
            /* if whitespace, we're not inside a word */
            outward = 0;

        }



        if ( period = 1 && outward == 0 && upper_case == 1) // If Uppercase letter follows a whitespace following a period
        {
            ++ns;
            period = 0;    // So that sentence count is not incremented if there are capitals elsewhere in the sentence
            outward = 1;
        }
    }

    if ( period == 1)
        ++ns;

    printf( "%lu sentences, %lu lines, %lu words, %lu chars\n", ns, nl, nw, nc );

    return 0;
}