#include <fstream>
#include <string>
#include <iostream>

using namespace std;

int main(){
    ifstream in("DATA2.txt");
    ofstream out("OUT2.txt");

    //int input[5];
    //string size[5];
    string input[5];
    for(int i = 0; i < 5; i++){
        in >> input[i];
        //size[i] = input[i];
    }

    /*for(int i = 0; i < 5; 1++){
        int curLength = size[i].length();
        if(curLength == 7){
            for(int j; j < 7; j++){








    }

    /*for(int i = 0; i < 5; i++){
        cout << input[i] << endl;
    }*/

    for(int i = 0; i < 5; i++){
        char holder = '0';
        for(int j = 0;  j < input[i].length(); j++){
            if(input[i].at(j) > holder) holder = input[i].at(j);
        }
        out << holder << endl;
    }



    return 0;
}