def find_op(N):
    dp = {1: ""}
    
    for i in range(2, N + 1):
        options = []
        
        if (i - 1) % 2 == 0:
            prev = (i - 1) // 2
            if prev in dp:
                options.append(dp[prev] + 'A')
        
        if (i - 1) % 3 == 0:
            prev = (i - 1) // 3
            if prev in dp:
                options.append(dp[prev] + 'B')

        if options:
            dp[i] = min(options, key=len)

    return dp[N]
N = int(input())
result = find_op(N)
print(result)