After using 2 loops in a list, the first element is removed from it automatically in Python

I made a program in which the user enters some integers and python displays how many even and odd numbers you entered. The code is the following:

ev_od_list = []
even = []
odd = []

number = int(input("Enter an integer(entering 0 would end the process): "))

while number != 0:
    number = int(input("Enter an integer(entering 0 would end the process): "))
    ev_od_list.append(number)

for i in ev_od_list:
    if i % 2 == 0:
        even.append(i)

even.remove(0)
print("The number of even numbers you entered is:", len(even))

for j in ev_od_list:
    if j % 2 != 0:
        odd.append(j)       

print(ev_od_list)
print("The number of odd numbers you entered is:", len(odd))

And the output…

Enter an integer(entering 0 would end the process): 1
Enter an integer(entering 0 would end the process): 2
Enter an integer(entering 0 would end the process): 3
Enter an integer(entering 0 would end the process): 4
Enter an integer(entering 0 would end the process): 5
Enter an integer(entering 0 would end the process): 6
Enter an integer(entering 0 would end the process): 7
Enter an integer(entering 0 would end the process): 8
Enter an integer(entering 0 would end the process): 9
Enter an integer(entering 0 would end the process): 10
Enter an integer(entering 0 would end the process): 0
The number of even numbers you entered is: 5
[2, 3, 4, 5, 6, 7, 8, 9, 10, 0]
The number of odd numbers you entered is: 4

In the second last line, you may notice that 1 has been removed from the list automatically. So, why is this happening?

Answer

The reason is you have a first call to input() which is overwritten by another call of input() and append the number after the second input() call. Here is the working code with much optimisations:

even = []
odd = []

number = int(input("Enter an integer(entering 0 would end the process): "))

while number != 0:
    if number != 0:
        if number % 2 == 0:
            even.append(number)
        else:
            odd.append(number)
        number = int(input("Enter an integer(entering 0 would end the process): "))

print("The number of even numbers you entered is:", len(even))
print("The number of odd numbers you entered is:", len(odd))