ferzi

import sys

def rec(i, n, used):
    if i == n + 1:
        print(used)
        sys.exit()
    for let in range(ord("A"), ord("A") + n):
        ans = True
        for queen in used:
            if not(abs(ord(queen[0]) - let) != abs(int(queen[1]) - i) and queen[0] != chr(let)):
                ans = False
                break
        if ans == True:
            app = True
            for queen in used:
                if queen[1] == str(i):
                    app = False
                    break
            if app == True:
                used.append(chr(let) + str(i))
            rec(i + 1, n, used)
            if app == True:
                used.pop()

n = 8
q = input()
rec(1, n, [q])