#include <iostream>
#include <cctype>
 
void output_words(std::ostream& _out, const char* s){
	int  m = 0, n = 0;
	char t, c = '\0';
	do {
		if(! isalpha(*s)){
			if((m > 1) && (m == n)){
				_out.write(s - m, m);
				_out << std::endl;
			}
			c = '\0';
			n = m = 0;
		} else {
			t  = toupper(*s);
			m += (int)(t >= c);
			c  = t;
			++n;
		}
	} while(*s++ != '\0');
 
	_out.flush();
}
 
 
int main(void){
	char s[] = "Abc def cba AbCdEfff AXBCZ (OPS) Xyz A AD";
	output_words(std::cout, s);
	return 0;
}

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