コード:

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

int main(){
	enum{ DONE, E_SMALL_W, E_SMALL_WC, };

	struct{
		struct{ char w[64]; int  c; } wc[1024];
		int                           n;
	} wn = {};

	ungetc(' ', stdin);

	char buf[sizeof(wn.wc[0].w)];
	while((scanf("%63[^A-Za-z0-9_]", buf) == 1) && (scanf("%63[A-Za-z0-9_]", buf) == 1)){
		if(!isdigit(buf[0])){
			int i = 0;
			while((i < wn.n) && (strcmp(wn.wc[i].w, buf) != 0)) ++i;

			if(sizeof(wn.wc)/sizeof(wn.wc[0]) <= i) return E_SMALL_WC;

			if(i == wn.n){
				++wn.n;
				strncpy(wn.wc[i].w, buf, sizeof(wn.wc[i].w));
			}

			++wn.wc[i].c;
		}
	}

	if(getchar() != EOF) return E_SMALL_W;

	for(int i=0; i<wn.n; ++i){
		printf("%s ......%d\n", wn.wc[i].w, wn.wc[i].c);
	}

	return DONE;
}

コード:

% ./a.out < test.txt > answer.txt