#include<iostream>
#include<string>
#include<cstring>
#include<map>
#include<algorithm>
using namespace std;
typedef map<string, int> msi;
int main()
{
	char line[1024], str[20];
	cin.getline(line, 1024);
	msi words;
	int i = 0, head = 0, len = 0;
	while (line[i]) {
		if (line[i] == ' ' || line[i] == ',' || line[i] == '.') {
			if (len > 0) {
				memset(str, 0, sizeof(str));
				strncpy(str, line+head, len);
				words[str]++;
				len = 0;
			}
			i++;
			head = i;
		}
		else if (line[i] >= 'A' && line[i] <= 'Z') {
			line[i] += ('a'-'A');
			len++;
			i++;
		}
		else if (line[i] >= 'a' && line[i] <= 'z') {
			len++;
			i++;
		}
	}
	msi::iterator itr;
	msi::iterator maxn;
	while (!words.empty()) {
		maxn = words.begin();
		for (itr = words.begin(); itr != words.end(); itr++) {
			if (itr->second > maxn->second)
				maxn = itr;
			else if (itr->second == maxn->s...