def convert24(str1):
    if (str1[-2:]== 'AM' and str1[:2]=="12"):
        return "00"+str1[2:-2]
    
    elif(str1[-2:]=="AM"):
        return str1[:]
    
    elif(str1[-2:]=="PM" and str1[:2]=="12"):
        return str1[:-2]
    
    else:
        return str(int(str1[:2])+12)+str1[2:11]
    
d = input("Enter time in hh:mm:ss AM/PM format:")
print(convert24(d))
print(convert24("03:04:20 PM"))