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

int isLegal(char *);

int main(int argc, char *argv[]){

char words[100];

FILE *fp = fopen(argv[1], "r");
if (fp == NULL) {
	printf("%s\n", "There was an error opening the file");
	return 1;
}
fscanf(fp, "%s", words);
while (!feof(fp)) {
	if ( isLegal(words) ) {
 		printf("%s\n", words);
	}
 fscanf(fp, "%s", words);
 }

fclose (fp);
return 0;
}

int isLegal(char *words) {
int len = strlen(words);
char foundFlag = 'y';
 		for (int a=0; a<len; a++) {
 			if ((words[a] < 'A' || words[a] > 'Z') && (words[a] < 'a' || words[a] > 'z'))
 				foundFlag = 'n';
 		}
 		if (foundFlag == 'n')
  			return 0;
  		else
  			return 1;
}