/*
ID: jack5251
PROG: calfflac
LANG: C++
*/

#include <fstream>
#include <string>
#include <algorithm>
#include <cstring>
//#include <functional>
#include <iostream>
#include <cstdlib>

using namespace std;

template<typename Arg>
class notalpha {
public:
    bool operator ()(const Arg &t) const {
	if(isalpha(t))
	    return false;
	else
	    return true;
    }
};

bool paltest(string str) {
    remove_if(str.begin(), str.end(), notalpha<char>());
    string cp = str;
    reverse(str.begin(), str.end());

    if (str == cp)
	return true;
    else
	return false;
}

int main() {
    ifstream fin("calfflac.in");
    ofstream fout("calfflac.out");

    string start = "";

    while(!fin.eof()) {
	string str;
	getline(fin, str);
	start += str;
    }

    cout << start << endl;

    string cp = start;
//    int mid = start.length()/2;
//    transform(start.begin(), start.end(), tolower);

    string longest = "";

    for (int x=0; x < start.length(); x++) {
	for (int y=start.length()-1; y > x + longest.length(); y--) {
	    if (start.at(x) == start.at(y))
		if (paltest(start.substr(x, y-x))) {
		    longest = start.substr(x, y-x);
		    y=0;
		}
	}
    }

    fout << longest.length() << endl
	 << longest << endl;

    return 0;
}