#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int INF = 1E9;
map<char, string> mp;
map<char, string> revmp;
vector<char> chars;

void envy(){
	mp['A'] = "01";
	mp['B'] = "1000";
	mp['C'] = "1010";
	mp['D'] = "100";
	mp['E'] = "0";
	mp['F'] = "0010";
	mp['G'] = "110";
	mp['H'] = "0000";
	mp['I'] = "OO";
	mp['J'] = "0111";
	mp['K'] = "101";
	mp['L'] = "0100";
	mp['M'] = "11";
	mp['N'] = "10";
	mp['O'] = "111";
	mp['P'] = "0110";
	mp['Q'] = "1101";
	mp['R'] = "010";
	mp['S'] = "000";
	mp['T'] = "1";
	mp['U'] = "001";
	mp['V'] = "0001";
	mp['W'] = "011";
	mp['X'] = "1001";
	mp['Y'] = "1011";
	mp['Z'] = "1100";
	mp['0'] = "11111";
	mp['1'] = "01111";
	mp['2'] = "00111";
	mp['3'] = "00011";
	mp['4'] = "00001";
	mp['5'] = "00000";
	mp['6'] = "10000";
	mp['7'] = "11000";
	mp['8'] = "11100";
	mp['9'] = "11110";

	for(char c = 'A'; c <= 'Z'; c++){
		revmp[c] = mp[c];
		reverse(revmp[c].begin(), revmp[c].end());
		chars.push_back(c);
	}
	for(char c = '0'; c <= '9'; c++){
		revmp[c] = mp[c];
		reverse(revmp[c].begin(), revmp[c].end());
		chars.push_back(c);
	}
}

struct item{
	string morse;
	vector<char> v;
};

// build using mp
string to_build(string s){
	vector<int> dp(s.size() + 1, INF);
	vector<pair<int, char>> prv(s.size() + 1, {-1, '$'});
	dp[0] = 0;
	for(int i = 0; i < s.size(); i++) {
		if(dp[i] == INF) {
			continue;
		}
		for(pair<char, string> j : mp) {
			if(i + j.second.size() <= s.size() && s.substr(i, j.second.size()) == j.second && dp[i + j.second.size()] > dp[i] + 1) {
				dp[i + j.second.size()] = dp[i] + 1;
				prv[i + j.second.size()] = {i, j.first};
			}
		}
	}
	string ans = "";
	for(int i = s.size(); i; i = prv[i].first) {
		ans.push_back(prv[i].second);
	}
	reverse(ans.begin(), ans.end());
	return ans;
}

string g(string morsed) {
	string ans = "$";
	for(int i = 0; i <= morsed.size(); i++) {
		string shudbp = morsed.substr(i);
		string rp = shudbp; reverse(rp.begin(), rp.end());
		if(rp == shudbp) {
			string make = morsed.substr(0, i);
			reverse(make.begin(), make.end());
			if(ans == "$") {
				ans = to_build(make);
			} else {
				string s2 = to_build(make);
				if(s2.size() < ans.size()) {
					ans = s2;
				}
			}
		}
	}
	return ans;
}


int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	envy();

	string s;
	getline(cin, s);
	string ns;
	for(int i = 0; i < s.size(); i++){
		if(s[i] >= 'A' && s[i] <= 'Z'){
			ns.push_back(s[i]);
		}
		if(s[i] >= '0' && s[i] <= '9'){
			ns.push_back(s[i]);
		}
	}
	s = ns;
	string morsed;
	for(char c: s){
		morsed += mp[c];
	}
	string ans = g(morsed);
	for(pair<char, string> i : mp) {
		string s2 = string(1, i.first) + g(morsed + i.second);
		if(s2.size() < ans.size()) {
			ans = s2;
		}
	} 
	string rv = morsed;
	for(char c : ans) {
		rv += mp[c];
	}
	string rv2 = rv;
	reverse(rv2.begin(), rv2.end());
	assert(rv == rv2);
	cout << ans.size() << " " << ans << "\n";
	/* string reverse_morsed = morsed;
	reverse(reverse_morsed.begin(), reverse_morsed.end());
	int n = morsed.size();
	// cout << morsed << endl;
	vector<char> ans;
	for(int i = 0; i < 100; i++){
		ans.push_back('A');
	}
	queue<item> q;
	q.push({"", {}});
	while(!q.empty()){
		auto [str, v] = q.front();
		q.pop();
		// cout << str << endl;
		if(v.size() > ans.size()) continue;
		{
			string reverse_str = str;
			reverse(reverse_str.begin(), reverse_str.end());
			string ns = morsed + reverse_str;
			string nns = ns;
			reverse(ns.begin(), ns.end());
			if(nns == ns){
				if(v.size() < ans.size()){
					ans = v;
					continue;
				}
			}
		}
		// if(str.size() >= n){
		// 	string overflow = str.substr(n);
		// 	reverse(overflow.begin(), overflow.end());
		// 	vector<char> to_construct = to_build(overflow);
		// 	if(!(to_construct.size() == 1 && to_construct[0] == '!')){
		// 		vector<char> final_v;
		// 		for(char c: to_construct){
		// 			final_v.push_back(c);
		// 		}
		// 		reverse(v.begin(), v.end());
		// 		for(char c: v){
		// 			final_v.push_back(c);
		// 		}
		// 		if(final_v.size() < ans.size()){
		// 			ans = final_v;
		// 		}
		// 		continue;
		// 	}
		// }
		for(char c: chars){
			string ns = str + revmp[c];
			int n = min(ns.length(), reverse_morsed.length());
			if(ns.substr(0, n) == reverse_morsed.substr(0, n)){
				vector<char> nv = v;
				nv.push_back(c);
				q.push({ns, nv});
			}
	}
	}

	cout << ans.size() << " ";
	for(char c: ans) cout << c; */

	// int n; int m;
	// cin >> n >> m;
	// vector<array<int, 2>> p(n);
	// for(int i = 0; i < n; i++) {
	// 	cin >> p[i][0] >> p[i][1];
	// }
	// vector<vector<array<int, 3>>> adj(n, vector<array<int, 2>>(4, {-1, -1}));
	// vector<int> inter(m);
	// for(int i = 0; i < m; i++) {
	// 	int ii; int ji; int ki;
	// 	cin >> ii >> ji >> ki;
	// 	ii--; ji--;
	// 	inter[i] = ki;
	// 	if(p[ii][0] < p[ji][0]) {
	// 		adj[ii][1] = {ji, i};
	// 	} else if(p[ii][0] > p[ji][0]) {

	// 	} else if(p[ii][1] < p[ji][1]) {

	// 	} else {

	// 	}
	// }
}

	// string s; cin >> s;
	// int n = s.size();
	// for(int i = 0; i < n - 1; i++){
	// 	if(s[i] == 'O' && s[i + 1] == 'O'){
	// 		cout << "INVALID" << endl;
	// 		return 0;
	// 	}
	// }
	// if(s.back() != 'O'){
	// 	cout << "INVALID" << endl;
	// 	return 0;
	// }
	// for(ll start = 3; start < 1000; start += 2){
	// 	ll res = start;
	// 	bool ok = true;
	// 	for(int i = n - 2; i >= 0; i--){
	// 		if(s[i] == 'E'){
	// 			res *= 2;
	// 		}
	// 		else{
	// 			res--;
	// 			if(res % 3 != 0){
	// 				ok = false;
	// 				break;
	// 			}
	// 			res /= 3;
	// 		}
	// 		if(s[i] == 'E' && res % 2 == 1){
	// 			ok = false;
	// 			break;
	// 		}
	// 		if(s[i] == 'O' && res % 2 == 0){
	// 			ok = false;
	// 			break;
	// 		}
	// 		if(__builtin_popcountll(res) == 1){
	// 			ok = false;
	// 			break;
	// 		}
	// 	}
	// 	if(ok){
	// 		cout << res << "\n";
	// 	//	break;
	// 	}
	// }