Iahub likes chess very much. He even invented a new chess piece named Coder. A Coder can move (and attack) one square horizontally or vertically. More precisely, if the Coder is located at position (*x*, *y*), he can move to (or attack) positions (*x* + 1, *y*), (*x*–1, *y*), (*x*, *y* + 1) and (*x*, *y*–1).

Iahub wants to know how many Coders can be placed on an *n* × *n* chessboard, so that no Coder attacks any other Coder.
The first line contains an integer *n* (1 ≤ *n* ≤ 1000).
from math import *

a=int(input())
mes=''
for i in range(a):
    for g in range(a):
        if g%2 == i%2:
            mes=mes+'.'
        if g%2 != i%2:
            mes=mes+'C'
        g+=1
    mes=mes+'\n'
    i+=1
print(mes)
