Answer:
while True:
try:
num1 = int(input("Enter a positive integer: "))
if num1 < 0:
raise ValueError
break
except ValueError:
print("Invalid input. Please enter a positive integer.")
while True:
try:
num2 = int(input("Enter a positive integer: "))
if num2 < 0:
raise ValueError
break
except ValueError:
print("Invalid input. Please enter a positive integer.")
while True:
try:
num3 = int(input("Enter a positive integer: "))
if num3 < 0:
raise ValueError
break
except ValueError:
print("Invalid input. Please enter a positive integer.")
if num1 < num2 and num1 < num3:
if num2 < num3:
print(num1, num2, num3)
else:
print(num1, num3, num2)
elif num2 < num1 and num2 < num3:
if num1 < num3:
print(num2, num1, num3)
else:
print(num2, num3, num1)
else:
if num1 < num2:
print(num3, num1, num2)
else:
print(num3, num2, num1)