Pythonプログラミングの練習、入力した文字列の中の各種の文字の個数を統計します

s=list(input('     :'))
count=len(s)
a=0;b=0;c=0;d=0
for i in range(0,count):
	if (s[i]<='z' and s[i]>='a') or (s[i]<='Z' and s[i]>='A'):
		a+=1
	elif s[i]<='9' and s[i]>='0':
		b+=1
	elif s[i]==' ':
		c+=1
	else:
		d+=1
print(a,b,c,d)

lst = list(input('       ，       ：'))
 
iLetter = []
iSpace = []
iNumber = []
iOther = []
 
for i in range(len(lst)):
    if ord(lst[i]) in range(65, 91) or ord(lst[i]) in range(97,123):
        iLetter.append(lst[i])
    elif lst[i] == ' ':
        iSpace.append(' ')
    elif ord(lst[i]) in range(48, 58):
        iNumber.append(lst[i])
    else:
        iOther.append(lst[i])
 
print('       ：%s' % len(iLetter))
print('    ：%s' % len(iSpace))
print('    ：%s' % len(iNumber))
print('      ：%s' % len(iOther))

string=input("     ：")
alp=0
num=0
spa=0
oth=0
for i in range(len(string)):
    if string[i].isspace():
        spa+=1
    elif string[i].isdigit():
        num+=1
    elif string[i].isalpha():
        alp+=1
    else:
        oth+=1
print('space: ',spa)
print('digit: ',num)
print('alpha: ',alp)
print('other: ',oth)