#include <fstream>
#include <iostream>

using namespace std;

ifstream input_stream;
ofstream output_stream;


char numToChar(int num) {
	char letter;
	switch (num) {
		case 15:
			letter = 'F';
			break;
		case 14:
			letter = 'E';
			break;
		case 13:
			letter = 'D';
			break;
		case 12:
			letter = 'C';
			break;
		case 11:
			letter = 'B';
			break;
		case 10:
			letter = 'A';
			break;
		default:
			letter = '0' + num;
	}
	return letter;
}

string intToHex(int num) {
	string res = "";

	res += numToChar(num / 16);
	res += numToChar(num % 16);

	return res;
}

int main() {
	input_stream.open("tests/input.7");

	int rgb[3];

	for (int i = 0; i < 3; i++) {
		int tmp;
		input_stream >> tmp;

		if (tmp > 255) {
			tmp = 255;
		} else if (tmp < 0) {
			tmp = 0;
		}

		rgb[i] = tmp;
	}

	cout << intToHex(rgb[0]);
	cout << intToHex(rgb[1]);
	cout << intToHex(rgb[2]) << endl;

	return 0;
}