Military Time - why it 4 not passing?

Question

input = str(input())
if len(input) > 5:
if 'A' in input and len(input) == 7:
print ('0' + input[0:4])
elif 'A' in input and len(input) == 8:
print (input[0:6])
else:
h = int(input.split(':')[0])+12
m = input [2:6]
print (str(h) + m)
else:
print (input)

Answer 1

For 12:00 AM, output should be 00:00
For 12:00 PM output should be 12:00
These two conditions don't get correct results...

Answer 2

Not for only exactly 12:00
What I said is if 12:MM AM, output shloud be 00(hour). =>00:MM, and for 12 hour PM, output should be 12 hour only 12:MM.. Hour changes, with Same minutes..
So there may be input, not only 12:00 AM/PM, but also may be
12:22 AM => 00:22
12:07 AM. => 00:07
12:45 PM => 12:45
12: 55 PM => 12:55

Answer 3

input = str(input())
if len(input) > 5:
if 'A' in input and len(input) == 7:
print ('0' + input[0:4])
elif 'A' in input and len(input) == 8:
print (input[0:6])
elif input == '12:00 AM':
print ('00:00')
else:
h = int(input.split(':')[0])+12
m = input [2:6]
print (str(h) + m)
else:
print (input)
Still not working