void outputWords(char *str, int str_len);

int main() {
char str[256];
gets_s(str);
outputWords(str, strlen(str));
return 0;
}

void outputWords(char *string, int str_len)
{
int cout;
char *token; const char delimiters[] = "?:;!,. -";
token = strtok(string, delimiters);
int i = 0;

  while(string[0] != ''){
    cout = 1;

    if (i > 0) {
        token = strtok(NULL, delimiters);
    }

    for (int i = 0; token[i] >= 1 ; i++){
        if (token[i] <= 'z' && token[i] >= 'a'|| token[i] <= 'Z' && token[i] >= 'A'){
            continue;
        }
        else{
            cout = 0;
            break;
        }
    }

    if (cout) {
        puts(token);
    }
    i++;
  }
}