N = int(input("Введите размер квадрата: "))
import time, os
pole = [[0 for _ in range(N)] for _ in range(N)]
x = N // 2
y = N // 2
direction = [-1, 0]
while x >= 0 and x < N and y >= 0 and y < N:
    if pole[y][x] == 0:
        pole[y][x] = 1
        if direction[0] == -1:
            direction = [0,-1]
        elif direction[0] == 1:
            direction = [0,1]
        elif direction[1] == -1:
            direction = [1,0]
        else:
            direction = [-1,0]
        x += direction[0]
        y += direction[1]
    else:
        pole[y][x] = 0
        if direction[0] == -1:
            direction = [0,1]
        elif direction[0] == 1:
            direction = [0,-1]
        elif direction[1] == -1:
            direction = [-1,0]
        else:
            direction = [1,0]
        x += direction[0]
        y += direction[1]
    for yParse in range(N):
        for xParse in range(N):
            char = ''
            if pole[yParse][xParse] == 0:
                char = 'O'
            else:
                char = 'g'
            print(char, end='')
        print()
    time.sleep(0.5)
    os.system('cls')