#include <fstream.h>

main()
{
	int count[26];

	int i;
	for(i = 0; i < 26; i++)
		count[i] = 0;

	ifstream in("day2a.dat", ios::nocreate);
	if(in == NULL)
		{
		cerr << "Error no input file\n";
		return 1;
		}
	
	int c;
	while(!in.fail() && (c = in.get()) != '\n')
		if(c >= 'a' && c <= 'z')
			count[c - 'a']++;	// If a lowercase letter, increase the count for that letter

	int max = 0;
	for(i = 1; i < 26; i++)
		if(count[i] > count[max])
			max =i;

	ofstream out("day2a.sol");
	out << count[max] << endl;
	for(i = 0; i < 26; i++)
		if(count[i] == count[max])
			out << char('a'+i);
	out << endl;

	return 0;
}