package main import ( "bufio" "bytes" "fmt" "os" "strconv" ) var sc = bufio.NewScanner(os.Stdin) var rdr = bufio.NewReaderSize(os.Stdin, 1000000) func main() { sc.Split(bufio.ScanWords) n := nextInt() n++ offset := 1 c := 0 for ; n >= offset; c++ { n -= offset offset *= 26 } s := bytes.Repeat([]byte{'A'}, c) i := c - 1 for ; n >= 26; i, n = i-1, n/26 { s[i] += byte(n % 26) } s[i] += byte(n) fmt.Println(string(s)) } func nextLine() string { sc.Scan() return sc.Text() } func nextInt() int { i, _ := strconv.Atoi(nextLine()) return i } func nextInt64() int64 { i, _ := strconv.ParseInt(nextLine(), 10, 64) return i } func nextUint64() uint64 { i, _ := strconv.ParseUint(nextLine(), 10, 64) return i } func nextFloat() float64 { f, _ := strconv.ParseFloat(nextLine(), 64) return f } func readLine() string { buf := make([]byte, 0, 1000000) for { l, p, e := rdr.ReadLine() if e != nil { panic(e) } buf = append(buf, l...) if !p { break } } return string(buf) }