import java.io.* import java.util.* import kotlin.math.* fun main() { // val T = nextInt() // repeat(T) {solve()} // pw.flush() solve() pw.flush() } fun solve() { val N = nextInt() val que = LinkedList>() que.offer(Pair("", N)) while( !que.isEmpty() ) { val p = que.poll() val s = p.first val n = p.second if( n == 1 ) { pw.println(s); break } if( n%2 == 1 ) que.offer(Pair("A"+s, (n-1)/2)) if( n%3 == 1 ) que.offer(Pair("B"+s, (n-1)/3)) } } /* struct begin */ data class Cell(val r: Int, val c: Int) data class Point(val x: Long, val y: Long) data class Pii(val fi: Int, val se: Int) data class Edge(val to: Int, val w: Long) class SegmentTree { val INF = 1 shl 30 val N = 1 shl 19 var a = IntArray(2*N) { INF } fun update(idx: Int, x: Int) { var i = idx + N a[i] = x while( i > 1 ) { i = i shr 1 val l = 2 * i val r = 2 * i + 1 a[i] = min(a[l], a[r]) } } fun rmq(L: Int, R: Int): Int { var l = L + N var r = R + N var res = INF while( l < r ) { if( (l and 1) == 1 ) { res = min(res, a[l]); l++ } if( (r and 1) == 1 ) { r--; res = min(res, a[r]) } l = l shr 1 r = r shr 1 } return res } } class BinaryIndexedTree(n: Int) { val N = n var a = Array(N+1) { 0L } fun sum(l: Int, r: Int): Long = sumSub(r-1)-sumSub(l-1) fun sumSub(i: Int): Long { var idx = i+1 var res = 0L while( idx > 0 ) { res += a[idx] idx -= idx and (-idx) } return res } fun add(i: Int, x: Long) { var idx = i+1 while( idx <= N ) { a[idx] += x idx += idx and (-idx) } } } class UnionFind(n: Int) { val N = n var parent = Array(N) {it} var rank = Array(N) {1} fun root(x: Int): Int { if( parent[x] == x ) { return x }else { parent[x] = root(parent[x]) return parent[x] } } fun unite(x: Int, y: Int) { val rx = root(x) val ry = root(y) parent[ry] = rx } fun same(x: Int, y: Int): Boolean = (root(x) == root(y)) } class RollingHash(S: String) { val s = S val N = s.length val P = (1L shl 61) - 1 val B = 565625656256562L val C = 2210565333882893047L val MASK30 = (1L shl 30) - 1 val MASK31 = (1L shl 31) - 1 var pb = LongArray(N+1) { 1L } var pc = LongArray(N+1) { 1L } var cs = LongArray(N+1) { 0L } fun init() { for( i in 1..N ) { pb[i] = mul(pb[i-1], B) pc[i] = mul(pc[i-1], C) cs[i] = modP(cs[i-1] + mul(pb[i], s[i-1].toLong())) } } fun hash(l: Int, r: Int): Long { return mul(cs[r] - cs[l] + P, pc[l]) } fun mul(a: Long, b: Long): Long { val au = a shr 31 val ad = a and MASK31 val bu = b shr 31 val bd = b and MASK31 val m = au * bd + bu * ad val mu = m shr 30 val md = m and MASK30 return modP(2 * au * bu + mu + (md shl 31) + ad * bd) } fun modP(x: Long): Long { val xu = x shr 61 val xd = x and P if( xu + xd >= P ) return (xu + xd - P) else return (xu + xd) } } /* struct end */ /* math begin */ fun intceil(x: Double) = ceil(x).toInt() fun intfloor(x: Double) = floor(x).toInt() fun gcd(x: Long, y: Long): Long { var a = max(abs(x), abs(y)) var b = min(abs(x), abs(y)) var r: Long do { r = a%b a = b b = r }while( r > 0 ) return a } fun modpow(X: Long, T: Long, P: Long = 9223372036854775807L): Long { var x = X var t = T if( t == 0L ) { return 1L }else { var res = 1L while( t > 0 ) { if( t%2L == 1L ) { res *= x res %= P t -= 1L } x *= x x %= P t /= 2 } return res%P } } /* math end */ /* utility begin */ fun cumulativeSum(a: LongArray): LongArray { val N = a.size var s = LongArray(N+1) { 0L } for( i in 1..N ) { s[i] = s[i-1]+a[i-1] } return s } fun rlowerBound(a: LongArray, x: Long): Int { val N = a.size var high = N-1 var low = 0 var mid: Int while( low < high ) { mid = (high+low+1)/2 if( a[mid] > x ) high = mid-1 else low = high } return high } fun lowerBound(a: IntArray, x: Int): Int { val N = a.size var high = N-1 var low = 0 var mid: Int while( low < high ) { mid = (high+low)/2 if( a[mid] < x ) low = mid+1 else high = mid } return low } fun permInv(p: IntArray): IntArray { val N = p.size var res = IntArray(N) { -1 } for( i in 0 until N ) { res[p[i]] = i } return res } /* utility end */ /* I/O begin */ var st = StringTokenizer("") val br = System.`in`.bufferedReader() val pw = PrintWriter(System.out, false) fun nextInt() = next().toInt() fun nextLong() = next().toLong() fun nextLine() = br.readLine()!! fun nextDouble() = next().toDouble() fun nextStrarr(n: Int) = Array(n) { next() } fun nextIntarr(n: Int, dec: Int = 0) = IntArray(n) { nextInt()-dec } fun nextLongarr(n: Int, dec: Long = 0L) = LongArray(n) { nextLong()-dec } fun next(): String { while( !st.hasMoreTokens() ) st = StringTokenizer(br.readLine()!!) return st.nextToken() } /* I/O end */