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#include <iostream>
#include <cstdlib>
 
using namespace std;
 
int main()
{
    int n, o;
    string s1, s2;
 
    cin >> n;
    if(n % 2 == 0) exit(0);
 
    cin >> s1;
    if(s1.length() != n) exit(0);
 
    o = n / 2;
    for(int i = 0; i < n; ++i)
    {
        s2[i] = '.';
    }
    s2[o] = s1[o];
 
    for(int i = 0; i < n; ++i)
    {
        cout << s2[i];
    }
    cout << endl;
 
    for(int i = 1; i <= o; ++i)
    {
        s2[o+i] = s1[o+i];
        s2[o-i] = s1[o-i];
        for(int j = 0; j < n; ++j)
        {
            cout << s2[j];
        }
        cout << endl;
    }
    return 0;
}

Main.java:1: error: illegal character: '#'
#include <iostream>
^
Main.java:1: error: class, interface, or enum expected
#include <iostream>
         ^
Main.java:2: error: illegal character: '#'
#include <cstdlib>
^
Main.java:6: error: class, interface, or enum expected
int main()
^
Main.java:9: error: class, interface, or enum expected
    string s1, s2;
    ^
Main.java:11: error: class, interface, or enum expected
    cin >> n;
    ^
Main.java:12: error: class, interface, or enum expected
    if(n % 2 == 0) exit(0);
    ^
Main.java:14: error: class, interface, or enum expected
    cin >> s1;
    ^
Main.java:15: error: class, interface, or enum expected
    if(s1.length() != n) exit(0);
    ^
Main.java:17: error: class, interface, or enum expected
    o = n / 2;
    ^
Main.java:18: error: class, interface, or enum expected
    for(int i = 0; i < n; ++i)
    ^
Main.java:18: error: class, interface, or enum expected
    for(int i = 0; i < n; ++i)
                   ^
Main.java:18: error: class, interface, or enum expected
    for(int i = 0; i < n; ++i)
                          ^
Main.java:21: error: class, interface, or enum expected
    }
    ^
Main.java:24: error: class, interface, or enum expected
    for(int i = 0; i < n; ++i)
    ^
Main.java:24: error: class, interface, or enum expected
    for(int i = 0; i < n; ++i)
                   ^
Main.java:24: error: class, interface, or enum expected
    for(int i = 0; i < n; ++i)
                          ^
Main.java:27: error: class, interface, or enum expected
    }
    ^
Main.java:30: error: class, interface, or enum expected
    for(int i = 1; i <= o; ++i)
    ^
Main.java:30: error: class, interface, or enum expected
    for(int i = 1; i <= o; ++i)
                   ^
Main.java:30: error: class, interface, or enum expected
    for(int i = 1; i <= o; ++i)
                           ^
Main.java:33: error: class, interface, or enum expected
        s2[o-i] = s1[o-i];
        ^
Main.java:34: error: class, interface, or enum expected
        for(int j = 0; j < n; ++j)
        ^
Main.java:34: error: class, interface, or enum expected
        for(int j = 0; j < n; ++j)
                       ^
Main.java:34: error: class, interface, or enum expected
        for(int j = 0; j < n; ++j)
                              ^
Main.java:37: error: class, interface, or enum expected
        }
        ^
Main.java:39: error: class, interface, or enum expected
    }
    ^
Main.java:41: error: class, interface, or enum expected
}
^
28 errors

Standard output is empty