Codeforces 384A Coder

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#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <cstdio>
#include <math.h>
#include <string>
#include <algorithm>
#include <vector>

using namespace std;

int n;
int ans;
char temp[1005][1005];

int main() {
	scanf("%d", &n);
	for (int i = 1;i <= n;++i) {
		for (int j = 1;j <= n;++j) {
			if (i % 2 == 1) {
				if (j % 2 == 1) {
					temp[i][j] = 'C';
					ans++;
				}
				else {
					temp[i][j] = '.';
				}
			}
			else {
				if (j % 2 == 1) {
					temp[i][j] = '.';
				}
				else {
					temp[i][j] = 'C';
					ans++;
				}
			}
		}
	}
	printf("%d\n", ans);
	for (int i = 1;i <= n;++i) {
		for (int j = 1;j <= n;++j) {
			printf("%c", temp[i][j]);
		}
		printf("\n");
	}
	return 0;
}