#include <iostream>
using namespace std;

char mat[200][200];

int main(void) {
    for (int i=0; i<200; ++i) for (int j=0; j<200; ++j) mat[i][j] = '.';

    for (int i=0; i<13; ++i) {
        for (int j=0; j<13; ++j) {
            for (int k=0; k<12; ++k) {
                mat[i*13 + j][k * 13 + ((j + k*i) % 13)] = 'O';
            }
        }
    }
    cout << 150 << endl;
    for (int i=0; i<150; ++i) {
        for (int j=0; j<150; ++j) {
            cout << mat[i][j];
        }
        cout << endl;
    }
    return 0;
}