5p21.cpp


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#include <iostream>

/*
 *
 * 5.20
 *
 *
 */

int main () {

	std::string s;
	std::string tmp;
	bool b = false;
	while(std::cin >> s) {
		if(isupper(s[0])) {
			if(tmp == s) {
				b = true;
				break;
			}
		}
		
		tmp = s;
	}
	
	if(b) {
		std::cout << tmp << std::endl;
	} else {
		std::cout << "There were no repeating words" << std::endl;
	}
	
	return 0;
}