#include <iostream>
#include <string>
#include <cctype>
#define is_delim(c)  (isspace((c)) || ispunct((c)))
 
void input_words(std::istream& _in, std::string& minw, std::string& maxw){
	std::string s;
	char c;
	int  e, k = 0;
 
	do {
		_in.get(c);
		e = _in.eof();
		if(is_delim(c) || e){
			if(k){
				if((s.length() < minw.length()) || !minw.length())
					minw = s;
				if(s.length() > maxw.length())
					maxw = s;
			}
			s = "";
			k = 0;
		} else {
			k  = 1;
			s += c;
		}
		if(c == '\n' || c == '\r')
			break;
	} while(! e && ! _in.fail());
}
 
 
int main(void){
	std::string minw, maxw;
	input_words(std::cin, minw, maxw);
	std::cout << "min word: " << minw << std::endl;
	std::cout << "max word: " << maxw << std::endl;
	return 0;
}

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Ввести строку, содержащую несколько слов