import time

def get_valid_input():
  while True:
   try:
    remaining_time = int(input("enter the time in seconds: "))
    return remaining_time
   except ValueError:
     print("invalid input")
     
remaining_time = get_valid_input()
while True:
 remaining_time -= 1
 time.sleep(1)
 if remaining_time < 11:
  break
 print(str(remaining_time) + " seconds to blast off.")
 
while remaining_time <= 10 and remaining_time > 0:
 print("T - " + str(remaining_time))
 remaining_time -= 1
 time.sleep(1)
 if remaining_time == 0:
  print("blast off!")
  

rocket_got_its_place = False
elapsed_time = 1

while rocket_got_its_place == False: #Start counting up.
    print(f"T + {elapsed_time}")
    time.sleep(1)
    elapsed_time += 1

import time
# function to print the time took the device to count up to specified time
elapsed_time = time.time() - start_time
# used to calculate the time difference starting from the program's running time
print(f"\n አሁን ባለበት ሁኔታ መሣርያዎት እስከ {set_time} ለመቁጠር {elapsed_time:.2f} ሰከንድ ፈጅቶበታል።")

def input_set_time():
# function used to take the times in numbers
while True:
  try:
   set_time = int(input("መሣርያዎት እስከ ስንት ድረስ እንዲቆጥር ይፈልጋሉ? (ተመራጩ 10000 ነው።): "))
   return set_time
  except ValueError:
   print("ቁጥር ብቻ ያስገቡ! \n ምሳሌ: 10000")
   
print(f"ሰላም! \n \n ይህ ፕሮግራም የማንኛውንም ዲጂታል መሣርያ ፍጥነት እስከተሰጠው ቁጥር ድረስ በመቁጠር ይለካል።  \n \n አጠቃቀም \n በመጀመርያ መሣርያው እስከ ስንት ድረስ መቁጠር እንዳለበት ይሞሉታል። \n ከዚያም መሣርያው ባለው አቅም በሙሉ እስከተሰጠው ቁጥር ድረስ ይቆጥራል። \n በመጨረሻም ቁጥሩን ለመቁጠር ምን ያህል ሰከንድ እንደወሰደበት ይነግራል። ")
print("")
set_time = input_set_time()
start_time = time.time()
i = 0
while True:
i += 1
print(i)
if i >= set_time:
  break
print_elapsed_time(start_time)