package main

import (
  "fmt"
  "time"
)

func main() {
  channel := make(chan time.Duration)
  
  fmt.Scanln()
  start := time.Now()
  
  go func () {
    for {
      channel <- time.Now().Sub(start)
    }
  }()
  
  for {
    select {
      case t := <- channel:
      fmt.Printf("%s%s%s\n", t, "\033[B", "\033[A")
    }
  }
}